Craig, Slow, John and others: Thank you all for your comments and suggestions.
There is no water damage and I inspect the roof once or twice a year, usually before washing and waxing. The TT has never been under a cover as stated. Also, if the outside temperature gets to 100 or above, I turn on the a/c in the trailer to prevent surprises, etc. from the warm weather - in other words, the trailer is well taken care of and this problem was a total surprise.
I'll post before and after pictures along with the cost so others will have a better understanding if they experience this problem.
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