What was found
DURING A HEAVY MAINT CHECK, CORROSION WAS FOUND IN THE MAIN CABIN FLOOR FORWARD ENTRY AREA FS 380 TO 440 AT RBL 45.50 SEAT TRACK HAS PITTING CORROSION IN BOTTOM CHANNEL. CORROSION WAS FOUND TO BE OUT OF LIMITS PER B727 SRM 531001. REMOVED SEAT TRACK PER SRM 513002. FABRICATED NEW SEAT TRACK FROM BAC 1520792 PER SRM B727 531002. ALODINED AND PRIMED PER B727 SRM 511002. INSTALLED PER B727 SRM 513002.