What was found
DURING HEAVY MAINTENANCE VISIT, SEAT TRACK WAS FOUND CORRODED AND GOUGED FROM STATIONS 620.00 AND 689.45 AND FROM 852.45 TO 959.45, RBL 24.75. REMOVED AND INSTALLED NEW SEAT TRACK IAW B727 SRM 53-10-1, 51-10-2, AND MAINTENANCE MANUAL 51-20-11.