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It is definately caused by water damage and the repair is fairly simple but time consuming. There is a video available and some sample clips of the video at the following internet address http://www.coachrepair.com/video.html
I hope this helps
Usually these are caused by water leaks...find the leaks first. The best way is to take off paneling and reset. Trying to get glue behind and then resetting is darn near impossible. (Check you insurance co for coverage)
I have bulges on both walls of a class c motorhome. Any ideas on repairs needed and how to do repairs would be appreciated.