Just found the exact same issue with my 23K!
I had read about this issue before taking possession of ours in May. There was no indication of a problem at that time. But last night, I took a look at the roof while I was washing my trailer after our trip out East.
I'm not sure when this problem first developped. I'm hoping that this was caused by this week's heat?
But as you can (sort of) see in the picture, the front wall of the trailer is slightly uneven. Is this normal? Or is it a sign of water damage?
Calling the dealer now....