As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE REMOVING APU INLET DUCT TO F.O.M. THE AFT SIDE OF CUT STRAP WAS FOUND EXFOLIATED. ACCOMPLISHED REPAIR IAW SRM 53-80-15-2R DETAIL I SHEET 2 ON AFT CUT OUT OF APU INLET AT STA. 1825 BETWEEN STRINGERS 5 & 6 FOR CORROSION DAMAGE ON STRAP PART # 148N3141-6 EXFOLIATED OUT OF LIMITS. MAJOR REPAIR