I can get access through a nearby storage opening. Tight though. I don't know to what extent UV may have contributed after the fact (the kayak has been appropriately coated) but it certainly wasn't the cause. Happened too soon.
Can you get to it from under or inside?
Also, and I am by no means an expert, but it looks like the problem may be due to the UV deteriating the plastic, making it brittle.
good luck