As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT GROUNDED FOR HEAVY MAINTENANCE. AFT LOWER CARGO INTERCOSTAL IS CORRODED AT LOWER SURFACE BETWEEN STATION 1285 - 1307 RIGHT BUTT LINE 12. REMOVED AND REPAIRED INTERCOSTAL AT STATION 1285 RIGHT BUTT LINE 12 IN ACCORDANCE WITH SRM 51-40-02 SECTION 7D.