What was found
DURING C4 CHECK, DISCOVERED CORROSION ON SEAT TRACK FROM FS 20 TO FS 21, Y-765. CORROSION WAS FOUND TO BE OUT OF LIMITS IAW AIRBUS 320 SRM 53-31-15 FIG 101. MAINTENANCE REMOVED SEAT TRACK FROM FR20 TO FR21, Y-765 IAW AIRBUS 320 SRM 51-42-11. RECEIVED NEW SEAT TRACK AND INSTALLED FROM FS 20 TO FS 21 Y-765 IAW AIRBUS 320 SRM 51-42-11 AND 51-72-11.