You'll probably have to contact your local dealer or Dutchmen Factory to find out. There may also, be Komfort owners out here that have that knowledge as you have called upon in this thread.
I've had four 5ers in the past 15 years. Two of which had roof leaks. I too, had the rubber roof peeled back and OSB board replaced with some 2x4 trusses on a KZ unit.
Depending upon how well the crew did their job stapling depends on whether the staples work up or not. This Infinity that I have now had the staples working up on the roof above the side walls. They didn't break through but they had lifted and pushed up on the rubber. Warranty is a beautiful thing. There's always items on these rigs that need a watchful eye no matter what brand.