Tom this is good info. I should have been more descriptive: my issue is manifesting itself as three approximately one foot depressions (not bubbles) where the front cap meets the roof.
Maybe he was using de-lamination as a word I'd understand? In any event, Keystone authorized the total replacement of the front cap (dealer's words) under warranty, and did so without any fussing. I assume that means they recognize some legitimate problem and are acting to fix it on their dime (which is good).
I'll ask them in any type of sealing needs to be done in that area between now and when we deaprt.
