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 CORROSION ON THE CABIN FLOOR AT Y512 BEAM, FROM FS 66 TO FS 67. CORROSION WAS FOUND TO BE OUT OF LIMITS IAW AIRBUS 320 SRM 53-00-14 FIG 102. MAINTENANCE REMOVED AND INSTALLED NEW FLOORBEAM AT Y512 FROM FS 66 TO FS 67 IAW AIRBUS 320 SRM 51-42-11 FIGURES 17 AND 20.