What was found
DURING C4 CHECK, DISCOVERED EXFOLIATION CORROSION LOCATED ON FLOORBEAM FROM FR 64 TO FR 70, Y512. MAINTENANCE REMOVED CORROSION AND FOUND TO BE OUT OF LIMITS IAW AIRBUS 320 SRM 53-00-14. REMOVED FLOORBEAM FROM FR 64 TO FR 70, Y512 IAW AIRBUS 320 SRM 51-72-11. INSTALLED NEW FLOORBEAM FROM FR 64 TO FR 70, Y512 IAW AIRBUS 320 SRM 51-72-11.