What was found
AFTER REMOVING HORIZONTAL STABILIZER ATTACH BRACKET, C2FS543A, TO INCORPORATE MOD 2/1338, BULKHEAD FOUND PERFORATED BY CORROSION. DAMAGE WAS NOT APPARENT UNTIL FITTING WAS REMOVED. ALL AREAS ON TAIL WHERE STEEL FITTINGS ARE RIVETED TO ALUMINUM STRUCTURE SHOULD BE SUSPECT. AIRPLANE IS OPERATED AS A SEAPLANE AND IS OCCASIONALLY OPERATED IN SALT WATER.