What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK MAINTENANCE FOUND LEFT O/B CF2 SEAT TRACK HAS CORROSION DAMAGE IN 20 AREAS. MAINTENANCE REMOVED AND REPLACED LEFT O/B CF2 SEAT TRACK IAW EMB170 SRM 51-40-02, 51-41-01, 51-43-01, AND 51-43-02. AIRCRAFT IS OUT OF SERVICE AND IS STILL IN C CHECK.