Did this get resolved?
I would walk you through how to tear down the pipes, but your coach is still so new.
The coach should still be under warranty, plus my guess is you are still in the first year of owning it
In the first year, you need to find every single thing that just isn't right and take it in to have it fixed.
So, don't try to hunt this down, have the dealer/service to that
IrnBear
P.S. I have the 35M as well 2018. My guess is they are the same. I have been into the guts of my structure looking for water leaks. So don't hesitate to ask.
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