Dan, do a search on delamination and you might find some info on it. I don't know much about it but I think it's probably something you would have to go back to the manufacturer with to get it fixed. It seems I've read somewhere that the only way to really fix it is to remove the section of wall that has delaminated and replace it with new. And then of course you have to find and fix the water leak that caused it in the first place. I don't think you can just "fix" the damaged part while leaving it intact. Others may know more about it and good luck with your project.
Steve & Nancy
2005 Itasca Sunrise 33', W20 Chassis, Ultrapower, Henderson Trac Bar
2012 Chevy Captiva Sport AWD, ReadyBrute Elite Tow Bar, Blue Ox Base Plate, Protect-A-Tow