What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND THE AFT RIGHT FLOOR SUPPORT BEAM AT FRAME 86 TO 87 CORRODED. MAINTENANCE REMOVED AND REPLACED THE AFT RIGHT FLOOR SUPPORT BEAM IAW EMB SRM 51-41-00, 51-43-00, 51-40-02 51-42-01, AND 51-43-01. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.