but what caused that damage? composite panels just don't disintegrate bythemselves, even if it was water damage, then thats a maintenance failure, impact damage on composite panels is usually inspected using tap tests to determine any delaminations, and a water tester to check for water contamination of the damage. (well at QF anyway when we still has jobs there)
judging by the pucture, it look like it has been hit by something, and possibly gone undetected for quite some time if that is a result of water/ice damage.. but if its damaged to a point to break the resin and fibres, then there should have also been evidence by a lot of paint damage/scuffing as well.