We have a 377 but encountered a similar issue. We have a washer and dryer and the connections were loose where the PEX line connects to the hot and cold valves. I had a pair of fitting clamps already so I just tightened up the clamps on the PEX line. Water would drip down the PEX tubing and puddle where you are showing. In our case, it only happened when the washer ran.
Those lines run in the wall and thru that kick board left of the dresser.
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Bill K
2018 North Point 377RLBH, Roadmaster Comfort Ride, Dexter E-Z Flex Suspension, Flexair 21k Pinbox, Victron MultiPlus II 2x120v 12v, power distribution, solar controller, smart shunt, 1000w of solar panels, 4 Lifepo4 200ah batteries
2017 Ford F350 Lariat CC DRW LB 6.7, Air Lift 7500XL with Air Lift dual channel wireless
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