What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND LT FF SEAT TRACK FRAME 16 CORRODED. MAINTENANCE REMOVED AND REPLACED LF FF SEAT TRACK AT FRAME 16 IAW EMB 175 SRM 51-40-02, 51-41-01, 51-43-03, 51-43-04, AND 51-41-02. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.