[Mikendebbie]

I tried to trace the crack by blowing up the photo. I can’t tell where the crack dies up by the scare light. Did you check the other side for a similar crack?

Just curious - have you “walked” the cap joint up on the roof to see if you can feel movement? I don’t mean for you to jump up and down on it - but put one foot centered on the cap joint with the other foot firmly on the roof. Take a step and put a bit of weight on the cap joint. Do that taking sort of baby steps all the way across the joint checking for movement, then turn around and walk back the same way. Don’t step off onto the fiberglass - it is not meant to support any weight.

This crack looks to me like the cap and some associated framing shifted forward. Be warned - I’m really just thinking out loud. I have no experience with this situation.