As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT ON GND FOR HEAVY MX, FAILSAFE INSPECTION. UPPER WING SURFACE AT STATION 187 REAR SPAR AREA PANEL IS BULGED UP. POSSIBLE SIGNS OF CORROSION UNDER PANEL. REMOVED CORROSION IAW SRM 57-20-1 FIG 101. REMOVED & INSTALLED FASTENERS IAW AM 28-11-00. LEAK CHECKED SATISFACTORY.