Roof panel replacement needed

Nyc : Yes I am sure the leak was there from the onset. The swollen vertical trim is proof. I didn't discover the soft area until well after owning the trailer. I didn't make the connect during the purchase. The dealership that sold it and quoted the repair is to get back to me on selling vs repairing. I know it will be a wash. I'll get more for the trade in or more of a discount. They do concern me a bit as they looked at the spot last year, never got back in touch and I had to call them back now a year later to get the quote. The sales person whom I spoke with today and sold the trailer has not called back.

C & M: I did look at several videos. No professionals doing what I am looking at doing. Most videos are on membrane repairs or entire replacement. One did show what I plan but the instructions were shaky.

I live in a subdivision in a Cul-de-sac. I would not be able to do the work here and the storage facility does not allow working on trailers or RVs. My thoughts were to move the trailer to a suitible location for the work. I just won't have much time to complete repairs.

Thanks all for the feedback,

Reg