Surfboard softened

Hey guys,
Pulled out my old Maurice Cole from storage the other day (probably 15ish) years old. The glass/foam has become really soft and can be dented just with finger pressure. What’s the go with this? Why does this happen? I assume it’s a non recoverable situation?
Pulled out my old Maurice Cole from storage the other day (probably 15ish) years old. The glass/foam has become really soft and can be dented just with finger pressure. What’s the go with this? Why does this happen? I assume it’s a non recoverable situation?