cadal99
So - amazingly last weekend we were actually able to get out and camp for the weekend.  We have a 2018 176S.  Everything went smoothly with dewinterization and the weekend,  but Saturday night at bed time noticed a small pool of water right at corner on floor under the fridge and where the water pump is.  Pulled off the panel and searched around.  The wood frame on the floor that the panels are stapled too was all pretty wet, but nowhere that I could reach around the pump, electric box, hoses, etc. down there was the least bit wet and all still pretty dusty and didn't look like it had been wet.  Ran hot and cold while watching around the pump - couldn't see any source of water.

Crawled under the storage in the back of the camper by the hot water heater - again the wood thin veneer panel behind the water heater between storage area and the interior of the camper had wicked up from the ground a not-insignificant amount of water.  Yet nothing on the floor itself felt the least bit damp - saw no evidence of leak from water heater itself.

So after wiping up what I could, set down paper towel where it had originally pooled that we spotted, went to bed.  in morning, floor and paper towel bone dry and the wood frame was dryer, but still drying out at that point.

Can't really figure out any good way of getting into that space without a major amount of tearing out of electrical/panels, etc. 

Any thoughts or suggestions?  Any chance it could be some kind of condensation issue around the fridge?  Fridge working great -the tube on the outside to drain condensation seems dry, but checked and it still seems firmly connected/set to the right spot.

Thanks all!
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John
We have a 2019 brand new 189R. A week after parking it in the driveway, straight from the dealer, I noticed the same type of water seepage on the floor by the refrigerator. Like you, my first thought was the pump, then the 'fridge. No source was evident. A couple of hours after using water in the tub/shower, I had a bigger stream of water from under the wall between the 'fridge and bathroom. Fortunately, the 189R has lots of access panels and I took off the one under the bathtub. In the tub drain is the anti-backup for the tub's drain. It is not a P trap. It is a simple cheap white plastic fitting with a 90 degree bend. There is a little flap inside the second part of the 90 preventing drain back up. Whebn the 90 becomes parallel to the floor it couples to the black drain pipe running to the gray water tank. In this case the white plastic drain pipe was about 1/2 inch higher than the black pipe where they are supposed to join. Evidently, Schreck at the factory just forced them together anyway, and sealed the joint. The black pipe union cracked under the pressure of weight in the tub. Drain water now leaked under the tub and the wall.  I was able to cut the plastic union fitting out leaving a 2 inch gap. I replaced the cut out union with a rubber hose fitting and two hose clamps. There is now flexibility in the line and no leak. 
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TravelerGuy
Nice work, John.  And I really loved reading  "Schreck at the Factory".
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Ike
John, 
You hit the nail on the head. I have 2018 177se and the shower drain leaked. The dealer fixed the drain but did not look under the linoleum in front of the shower. Sure enough there was mold underneath, I bleached the mold, and scrubbed the floor with an abrasive pad, then dried the floor with a fan. I finished the project by painting the floor with a mold resistant paint and replaced the linoleum. 
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OkieCamper
FYI...vinegar works better on mold than bleach.
https://restorationmasterfinder.com/restoration/what-kills-mold-bleach-vs-vinegar/
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cadal99
Thanks all!  Fortunately or unfortunately, our 176S has simple wet bath shower only, and it's very simple drain connection and on the opposite side of the camper from the fridge/water heater/inlet/pump, so I am 99% sure that there's no interaction between the shower/toilet and where the leak is.  But appreciate the brainstorming!  I'm headed out to the camper to see what I can see. 
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cadal99
and for good or bad, all my testing, I could still find nothing.  Pulled the electric panel out so I could see everything under the fridge.  Ran water through city water supply as well as through the freshwater tank.  ran hot and cold water, both with water heater on and off.  Even sprayed water up into the wheel well relatively forcefully even though that definitely wouldn't have been a condition we encountered while camping.  But since it seemed a common problem of poor sealant for others and the wheel well was in that area, figured I'd best check that.  And while I could still see the water marks from where things had wicked up into the wood when I had the issue, everything remained bone dry.  So, other than duration and exact leveling conditions, not sure what else would have been different between my couple hours of testing and couple of days camping... oh well, it's back in storage till we can get some campsites opened up for new reservations again around here or 4th of July - whichever comes first 🙂  But if someone can think of anything I haven't thought of, I'm still all ears!
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John
When you are filling your water tank through the outside filler,the filler could leak inside. When you are done and go camping you discover water on the floor and it has reached inside under the wall. With water still in the tank, you check your drains and water lines and get nothing because if the leak is in the filler somewhere, it is not under pressure and is above the water line. Each time you fill you get water, but only when you fill.  
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Petexski
Had leak from tank fill on 177. Turns out corrugated pipe on smooth outside fitting was problem. They cranked down the hose clamp and damaged corrugated pipe so it had a hole and leaked down wall and onto floor. 
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