As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PERFORM THE MAINTENANCE WORK (7C CHECK CARD NO.:C53-300-10 PART 1 OF 2), CORROSION WAS FOUND ON THE AFTER FLANGE OF THE LT HORIZONTAL STABILIZER T/E LOWER BEAM AT ELEV STA 156~160 AND ELEV STA 186.5~190. THE DEPTH AFTER BLENDOUT IS OUT OF LIMIT. THE APPROVED REPAIR DATA (FAA FORM 8110-3) HAS BEEN RECEIVED FROM DER ON SEP 19, 2011.