I have a 2004 22t. The camper is in very nice condition. I have noticed some swelling along the edge of the roof on the back side of the camper and a small soft spot at the front corner at the front cowling. It feels like the underlayment under the rubber roof is swelling. It runs from the the front corner town about half way the length of the camper. I have not noticed any leaks inside, the back wall feels sturdy. I have patched with eternabond and ran a strip of eternabond down the entire length of the camper on that back side. The swelling seems to be about 8-10 inches wide. i'm almost afraid to ask, but do I need to look at a full roof replacement? if so, how difficult is that replacement?