As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUPPORTING STRUCTURES AND ATTACHING RIVETS FOR EMPENNAGE ATTACH FITTINGS PN 350061-7, AND DASH 8, WITH SEVERE CORROSION. CORROSION IN THIS AREA DIFFICULT TO DETECT UNTIL EXTREMELY ADVANCED. NINETY PERCENT OF ATTACHING RIVETS FAILED DUE TO CORROSION. SUSPECT CAUSE: AIRCRAFT BASED IN PUERTO RICO FOR 22 YEARS.