What was found
DURING C4 CHECK DISCOVERED CORROSION ON LOWER SILL OF L1 DOOR, FROM FS 16 TO FS 20, Y 1584. NO ALLOWABLE LIMITS FOUND. MAINTENANCE REMOVED AND REPLACED THE FITTINGS ON L1 DOOR, LOWER SILL, FROM FS 16 TO FS 20, Y 1584, IAW AIRBUS 320 SRM 51-72-11.