As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER REMOVAL OF AFT DRAIN MAST, FUSELAGE SKIN EXTERIOR SURFACE FOUND CORRODED BETWEEN STRINGER 25 & 26R BS 1660 & 1680. CORROSION REMOVED AND FOUND OUT OF LIMITS IAW SRM 53-00-01 FIG 101 DETAIL II REV 113. REPAIRED IAW EA F-5330- T0312967 PART 1. REPAIR CLASSIFIED AS MAJOR.