What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND THE LEFT WING RIB 10 EXTENSION CRACKED. MAINTENANCE REMOVED AND REPLACED THE LEFT WING RIB 10 EXTENSION IAW EMB SRM 51-41-01, 51-43-03, 51-43-04, AND 51-43-02. MAJOR REPAIR, THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.