Doesn't sound good at all. I know I'd be very concerned. Can you access the ceiling cavity from inside by removing the AC trim or nearby lights, speakers, etc? You might be able to see what's going on or feel by hand. Maybe you could take it to a reputable independent RV repair shop and get an inspection & report and submit it to Keystone and the dealer.
Met a Keystone TT owner in a CG once. His TT roof leaked like a seive from new. Dealer couldn't fix it so it got sent to the factory who only made it worse. He ended up fixing it himself. I think there is a difference tho. between east and west coast unit quality.
*Maybe* you can discover the cause and fix it yourself which you might be able to do better than anyone else anyway.
