As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN PERFORMING MAINT. ON A/C, NOTED RUST ON HEADS OF MAIN SPAR WING ATTACHING BOLTS. REMOVED BOLTS FINDING THEM BADLY CORRODED AND RUSTED. INSPECTED FUSELAGE BEARING BORE AND SPAR BOAR AND INSTALLED NEW AN8-24A BOLTS. AGE AND ENVIRONMENT MAY BE PROBLEM, RECOMMEND COATING BOLTS AND BORE WITH EPOXY PRIMER AND INSTALLING WET.