As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE WORKING NR O494, FOUND CORROSION ON TOP SIDE OF LOWER FUEL CELL SKIN RBL 41 WL 162.5 BS 870. REMOVED CORROSION FROM TOP SIDE OF LOWER FUEL CELL SKIN RBL 41 WL 162.5 BS 870. FOUND TO BE OUT OF LIMITS PER FEDEX SRM 51-30-1 AND REPAIRED PER EA 7-5730-26153.