As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C-13 CHECK A .5 INCH CRACK WAS FOUND ON L1 DOOR INNER SKIN AT UPPER CORNER ACCESS HOLE FOR FOR UPPER END OF VERTICAL TORQUE TUBE. MAINTENANCE REMOVED DAMAGED AREA OF SKIN, FOUND MATERIAL LOSS TO BE WITHIN LIMITS PER B737-200 SRM 52-00-2 PG 16, 21-24, FIG. 6.