What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND THE INBOARD FF1 FLOORBEAM AT FRAME 17 CORRODED. MAINTENANCE REMOVED AND REPLACED THE INBOARD FF1 FLOORBEAM AT FRAME 17 IAW EMB 175 SRM 51-40-02, 51-41-00, 51-41-02, 51-43-01, 51-43-02, AND 51-23-06. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.