As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-4 CHECK INSPECTION, FOUND RIGHT WING LEADING EDGE XFS 310.250 TO 329.000 APPROXIMATELY HAS BULGING SKIN AT SPAR. REMOVED CORROSION BY CUTTING SKIN FROM XFS291.5 TO XFS400 AND FABRICATED FILLER AND DOUBLER PER SRM 57-2-1. CORROSION CARD NR 116R-0551, NON-ROUTINE TASK CARD NR 87389.