As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT IS IN A C-CHECK STATUS WHEN INSPECTION FOUND TOOLING MARKS ON THE LT WING ZONE 532 UPPER SKIN, THAT SHOWED A GROOVE CUT INTO THE SKIN. MAINTENANCE INSTALLED A REPAIR TO THE UPPER SKIN IAW EC5710-01240. ALL WORK ACCOMPLISHED AND WILL BE RELEASED AT THE END OF THE CHECK.