What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND THE LEFT FUSELAGE FORWARD NUMBER 1 SEAT TRACK CORRODED FRAMES 16 AND 19. MAINTENANCE REMOVED AND REPLACED THE LEFT FORWARD NUMBER 1 SEAT TRACK IAW EMB 170 SRM 51-40-02, 51-41-01, 51-43-01, AND 51-43-02. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.