AF had issues with delamination early on. Sounds like water infiltration at one point and will only get worse if not addressed. Any seam or seal area is culprit. A good place to check for leaks is around the front cabover window seals. Another common area is the top roof seam where the cabover filon meets up with the roof. Once water gets into any of those areas it can run down into the under belly of the cabover.
Add to the above that often the clearance lights will leak. I would opt to keep looking as delam is the outward appearance of an inward bigger water intrusion issue.