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 Y-1350 FLOORBEAM PLATE AT FS 16. NO CORROSION REMOVAL LIMITS AVAILABLE IN THE AIRBUS SRM. MAINTENANCE REMOVED AND INSTALLED NEW FLOOR BEAM PLATE AT Y-1350 AND FR16 IAW AIRBUS 320 SRM 51-42-11 FIG 8.