Bigfoot 2500 Front Fiberglass Delam Repair Questions

Adamis, what exactly did the guy from bigfoot say the repair was structurally. Is it wood under the fiber? is it that the Fiber has lost it's strength? Build quality? I'm curious as to what the repair is actually going to repair. As far as the door, On my coachman many years ago, My door sagged a little but only off the truck. It was actually the roofing up over the door that grew week and worn. It was wood though so totally different I think...