As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND SMOKING RIVETS ON TOP OF FUSELAGE IN AREA OF THE REAR CENTER SECTION SPAR. REMOVED RIVETS (APPROX. EIGHT ON EACH END OF SPAR) AND FOUND RIVET HOLES SEVERELY ELONGATED. FACTORY ORIGINAL RIVETS WERE .1250 INCH DIA. AND SEVERAL HAD BEEN REPLACED IN THE FIELD WITH .1562 INCH RIVETS. ALL OF THE AFFECTED RIVET HOLES HAD BECOME OVERSIZED TO AN EXTENT THAT RENDERED THE SPAR AND OVERLAPPING FUSELAGE SKINS UNSERVICEABLE.