When I de-winterized for the 1st time I flooded the kitchen/living room area in this RV.. Turns out many RVers have a few loose nuts lying about (Also a few loose screws, like the ones holding the wires in the breaker box)..
One of those nuts was the compression fitting on a PEX line under the sink, the line pulled apart and flooded everything. I put it back together and tightened it down 10 years ago.. Did not touch it for 10 years.. Just re-did it (new kitchen faucet so I had to mess with it)
I'd check the pipes and make sure they are secure Wiggle them. Mine came out in my hand when I did that, Nut was not nearly tight enough.