What was found
DURING C4 CHECK DISCOVERED, GALVANIC CORROSION LOCATED ON FLOORBEAM FROM FR 65 TO FR 67, Y912. MAINTENANCE REMOVED CORROSION AND FOUND TO BE OUT OF LIMITS IAW AIRBUS 320 SRM 53-00-14. REMOVED FLOORBEAM FROM FR 65 TO FR 67, Y912 IAW AIRBUS 320 SRM 51-72-11. INSTALLED NEW FLOORBEAM FROM FR 65 TO FR 67, Y912 IAW AIRBUS 320 SRM 51-72-11.