As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN ANNUAL INSPECTION, VISUAL INSPECTION UNVEILED THE OTBD RIB ON THE RT FLAP HAD EXCESSIVE CORROSION. AFTER UNRIVETING THE L/E SKIN, IT WAS DISCOVERED THAT ALL THE RIBS WERE CORRODED BEYOND REPAIR AND THE FLAP WAS SCRAPPED FOR A SERVICEABLE UNIT.