What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND THE LEFT FLOORBEAM CORRODED AT FRAMES 86 TO 87. MAINTENANCE REMOVED AND REPLACED THE LEFT FLOORBEAM AT FRAMES 86 TO 87 IAW EMB 175 SRM 41-41-42, 51-41-41, 51-41-01, 51-40-02, 51-42-01, AND 51-43-01. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.