Hello:The other day I pulled out the floor boards over by where the mast sits on the keel of my Citation 31. I discovered what I can only describe as two fiberglass stringers on which bottom of the mast sits on. One of the stringers, the one over by the forward bulkhead, is cracked and bulging. It seems that the stringer has an internal frame of iron. Mine is corroding and the spalling has caused it to bulge and crack.This seems quite serious to me since it must take a lot of compression from the mast.Has anyone run across this? How have you repaired it?JR