As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE OUT OF SERVICE IN HEAVY CHECK, MAINTENANCE FOUND CORROSION AT L2 DOOR AFT FRAME FLOOR STRINGER 17L REF NR 6243360 AND FOUND CORROSION AT SPLICE PANEL BETWEEN FR 87-88 REF NR 6243327. BOTH DISCREPANCIES WERE EVALUATED AND CORRECTIVE ACTION WAS REMOVED AND REPLACED L2 DOOR AFT FRAME FLOOR STRINGER IAW SRM 51-40-08 PAGES 1-4. THIS AIRCRAFT REMAINS OUT OF SERVICE FOR DURATION OF THE HEAVY CHECK COMPLETION.