I have developed a leak under the port genoa track. One of the holes for an attaching bolt is leaking water into the cabin. I tried to loosen the nut off of the bolt underneath the deck, but the nut seems rusted on. None of the outside bolts will turn with a screwdriver. All the nuts underneath look rusty. Weren't they supposed to be SS? Any suggestions on how to free the bolt and nut so I can reseal it? Many thanks.