As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION OF THE WING ATTACH BOLTS, THE HEADS AND NUTS WERE FOUND CORRODED. INSTALLED NEW BOLTS AND FOUND THAT THE REMOVED BOLTS HAD SOME CORROSION ON THE SHANK. 3 OF THESE BOLTS WERE SEVERELY CORRODED WITH MAJOR PITTING ON THE SHANKS. THESE BOLTS APPEAR TO BE ORIGINAL. INSPECTED THE HOLES FOR CORROSION WITH BORESCOPE, FOUND OK.