As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, MAINTENANCE REPORTED A CRACK (5/16") ON THE LT WING LEADING EDGE SKIN AT NR 2 SLAT O/B TRACK CUTOUT ON UPPER END. MAINTENANCE REMOVED CRACK FROM THE LT WING LEADING EDGE SKIN AT NR 2 SLAT O/B TRACK CUTOUT ON UPPER END IAW SRM 57-49-01, REPAIR 06. 51-23-04, 51-23-05 & 51-23-06. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.