My understanding with delamination is when it starts, its too late. I have talked with several people about this issue not only on Jayco RV's but others as well. The only corrective action that I was only aware of was replacement of the wall. Moisture is the enemy. Even if you could repair the delaminated section, what about the area around it that shows no delamination? By no means am I an expert in this area, I have only read and heard experiences about this issue from others. In the long term, it never turned out well. Like Hitch Pin said, BIG BUCKS TO REPAIR.
The bottom line is you MUST check all your roofing and window seals on a regular basis and take corrective action. Failure to do this would be a guarantee for water intrusion.
2015 Jayco 24FBS Elite Jay Flight
2013 Chevrolet Silverado 2500HD 4X4 6.0L 3.73 Axle
HD Trailering Package with Integrated Brake Controller
Equal-i-zer Hitch 10k/1000