As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AIRCRAFT D-CHECK MAINTENANCE DISCOVERED CORROSION ON THE UPPER SKIN OF THE CENTER WING AT STA 1140, BETWEEN LBL 100 AND LBL 110. THE DAMAGE WAS REMOVED PER 747-400BCF SRM AND FOUND TO BE BEYOND PUBLISHED LIMITS. CORROSION BLENDED OUT AND REPAIR COMPLETED PER FVCI CONTROL # 26123-2 INCLUDING SRM 57-10-01, 57-00-04