As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS IN BASE MAINTENANCE. DURING C4 CHECK MAINTENANCE FOUND CRACK DAMAGE EMANATING FROM FASTENER HOLE COMMON TO THE LEFT LOWER WING SKIN, ADJACENT TO OUTBOARD OF RIB 10 DRAIN HOLE. REPAIRED SKIN PER SRM 57-10-01 REPAIR 54 & EA NR 276061.