One tip comes to mind about this leak thing.
Take a look at the bottom edge of what I call the wing walls before you take it to the shop
The little short walls just behind your driver and passenger cab doors
This is how I discovered that I had a leak. the metal trim along the bottom edge was coming loose.
Others here in the past have found the same thing
Turns out that the core board for these short walls are some of the only wood in my coach, and it's just raw exposed plywood edges. That in of itself isn't the issue. Mine was leaking up on the roof, and without my knowing seeping through the side wall apparently over the door, and working its way down into this wing wall. No wood in the side wall there, but there was rot in tis wing wall, mostly down low but some higher up too.
Easy to remove the vinyl padded panel that covers it on the inside. The upholstery buttons (if it's like mine, are just snaps that pop right off, revealing screws. Just a few screws the whole things comes off and you can get a good look at the plywood wall
I'd suggest looking at that trim, and probe under it a bit if you can. If any of that wood is soft I'd question your tech and Thor about it. If it seems dry and solid I wouldn't worry.
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