As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C4 CHECK DISCOVERED LEFT A/C BAY FRAME 39 INBOARD VERTICAL STIFFENER CRACKED 1.3" IN LENGTH. MAINTENANCE REMOVED AND INSTALLED NEW STIFFENER AT FRAME 39 AND STR 35L IAW AIRBUS A320 SRM51-42-11 PGS 22 AND 23 AND SRM 51-72-11 PGS 1 AND 2.