As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEVERE CORROSION ON SPAR BETWEEN HINGES AND SPAR. AIRCRAFT WAS NOT HANGARED. WATER SEEPAGE BETWEEN STEEL HINGE BRACKET AND ALUMINUM SPAR DEVELOPED TO CAUSE CORROSION TO BLISTER AROUND RIVETS FASTENING HINGE TO SPAR. THIS CONDITION WAS FOUND DURING THE FABRIC RECOVERING PROCESS.