As far as I know, the fuselage shell consists of an outer and an inner
fiberglass
skin, with a layer of foam about 3mm thick between the two skins. I recall
when fitting the door shoot bolt stops modification, that it was necessary to
drill right through both skins for the bolt holes and then to pick out the foam
surrounding the holes from between the skins.
So unless the inner fuselage skin is also affected by excess heat, my guess is
that any repair would only be needed to the outer skin. The repair would need
to be done by somebody with suitable expertise.
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