As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAIL SECTION APU COMPARTMENT AFT SIDE OF BULKHEAD BS 1088, STIFFENER HAS CORROSION ON UPPER SURFACE AT WL-225 LBL-12 TO RBL-12 17" FROM THE COMPARTMENT CEILING. R & R APU COMPARTMENT STIFFENER ON AFT FACE OF 1088 BULKHEAD WL-225 LBL-12 TO RBL-12 IAW SRM 51-40-02.