2000 winni adventurer roof problem

Here is a weird one. We are currently crossing Newfoundland on a three week holiday. We were up at the north end looking for icebergs (which we found). Crossing a very barren area the winds got very high one day. Suddenly we heard a noise at the rear roof area. The side wind had gotten under the fiberglass roof and torn a piece of the roof off. We put a few ratchet straps across the roof so we wouldn't lose any more of the roof. A piece about two feet by three feet had been torn from the roof. We got to St Anthony and bought some fiberglass mesh and resin at a hardware store to make a temporary repair. Upon closer inspection of the damaged area we noticed that the Styrofoam insulation under the fiberglass was what appeared to be melted to half the size and had created a void below the fiberglass. The only thing I can think of is that heat from the heat pump, which travels in cavities in the foam had overheated the foam and melted it. There is a cavity about two feet wide in from the edge about ten feet long. It looks like when I get home I will have remove the entire area of roof, replace the foam, then repair the fiberglass roof. The roof in this area appears kind of bubbled due to the void under it. Has anyone encounter this before.