I have a 2008 3300SK with the same problem....Bubbles on the exterior above one of the slide outs. The camper doesn't get used much, and we are very concerned. We have called customer service and been told that the camper is out of warranty, so they will not do anything for us. We've had a couple of local rv centers look at the camper, and none of them want to attempt to fix it. If someone who has had success in getting the factory to fix theirs could give us the name of the person they talked with, we would appreciate it. Any other suggestios would also be appreciated.