As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMPENNAGE APU AIR INLET DOOR CUT OUT FWD STRAP HAS CORROSION AT STATION 1787 STRINGER 3R - 6R AFTER APU AIR INLET DOOR HOUSING REMOVED. STA 1787 STR 3R - 6R APU INLET DOOR CUT-OUT CORROSION THROUGH FWD STRAP REMOVED AND REPLACED WITH NEW STRAP P/N 148N3138-20 AS PER BOEING DWG 148N3105 SHT 1 REV C. REPAIR CLASSIFIED AS MAJOR