What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND THE SEAT TRACK EXTENSION ON RIGHT SIDE FRAMES 85 TO 89 CORRODED. MAINTENANCE REMOVED AND REPLACED SEAT TRACK BEAM IAW EMB 175 SRM 51-42-01, 51-40-02, 51-42-03, AND 51-43-03. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.