What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND INBOARD LEFT CF3 SEAT TRACK AT FRAME 84 CORRODED. MAINTENANCE REMOVED AND REPLACED SEAT TRACK INBOARD LEFT CF3 AT FRAME 84 IAW EMB 190 SRM 51-43-01, 51-43-02, AND 51-43-04. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.