Bulge in exterior fiberglass...

That's under the awning and above where I've had my plants (some hanging from the awning) this year -- first time I've had plants outside. Could that have contributed?

May have a slight leak on that window.

I am never staying by the beach again! All my electronics die, my knees fall apart ("delaminate") -- and dampness just plain isn't good for the human body. Summer by the beach is overrated. Heading to Palm Springs this winter. Done with "wet".

No way to fix it?

Delamination due to moisture. Pretty common problem, unfortunately.