look at the base of the wall. There should be a thin angled piece of wood that bridges the gap between the wall and the floor.
Damon runs the water lines under this angled wood, at least that is how they do it in my Daybreak. If you are using the city water connection, you are hearing the water running through the lines as it comes into the coach from the city water connection.
At least that is what I think it is. Check for wet spots as well. If it is not just the water running through the lines, check the fittings to make sure there is not a small leak.
Good Luck, and welcome!
Bill
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2020 Grand Design Reflection 315RLTS
2019 GMC Sierra Denali Duramax
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