Yikes. I've been down this road - sorta - before with previous TT I've owned. The problem with water, is that it is clear, sneaky, and is lazy. Clear you can't see where it got to. Sneaky... It will make its way to places you'd never expect. Lazy, it takes the path of least resistance.
I am so sorry u are experiencing this. Please pull up carpet, open the bottoms of the cabinetry in the bunkhouse, and pull the enclosed belly covering.
When someone says their heat vents filled with water, that is a HUGE PROBLEM TO FIX RIGHT NOW. Do not let it sit for a month in the dealer lot, because mold and rot will set in, in a matter of days in the high temperatures of seotember
Craig T. Bailey
2015 Jayflight 32BHDS
2007 Chevy 2500HD Crew 4x4 Z71