As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE REMOVING THE APU INLET DUCT TO F.O.M. CORROSION WAS FOUND ON THE FWD SIDE OF THE DUCT CUTOUT. REMOVED & REPLACED CORRODED STRAP ON APU INLET DUCT CUTOUT FWD STRAP WITH ONE FABRICATED ON TRAVELER T22/1605340 PART # FX148N3138-20 IAW SRM 51-40-02 & DRAWING # 148N3138. MAJOR REPAIR.