Thanks for all the replies. I don't really have any way to view the potential damage. It is all right where the ceiling meets the wall above the slide. That's what makes me thing it could be the caulking at that edge of the unit. If the wood framing needs repair, is that something that is done from the inside? Like remove the ceiling panels and get to it that way?
We have found some bubbling in the ceiling of our TT, and rust around a couple tacks that keep the ceiling covering material on, so it appears we have a leak in the roof along the edge of the unit above the slide. Our plan is to re-caulk the whole roof. Assuming that is where the leak is and caulking fixes it, is there anything else to worry about with the bubbling we see in the ceiling? Should we be taking the ceiling covering off to see what's going on up there? That seems like a huge job. Thanks for any advice you can give.