As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING REMOVAL OF THE VENTRAL FUEL TANK, THE ABOVE MENTIONED NUT WAS FOUND TO BE SEIZED IN PLACE. 2 CRACKS WERE NOTED ON THE OUTER SURFACE OF THE NUT: 1 PERPENDICULAR TO THE DIRECTION OF THE THREADS. AFTER DISASSEMBLY, SEVERE CORROSION OF THE THREADED PORTION OF THE NUT WAS FOUND.