What was found
MCN - MAJOR REPAIR - DURING BC4 CHECK DISCOVERED LEVEL 2 EXFOLIATION CORROSION ON FLOORBEAM AT FR 66, BL 36L, AND Y765. CORROSION WAS REMOVED AND REWORK WAS FOUND TO BE OUT OF LIMITS. MAINTENANCE REMOVED AND REPLACED THE FLOORBEAM AT FR 66, BL 36L AT Y765 IAW AIRBUS 319 SRM 51-72-11.