What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND CRACKS ON RIGHT WING RIB 10 UPPER FASTENER. MAINTENANCE REMOVED AND REPLACED RIGHT WING RIB 10 IAW EMB SRM 51-40-02, 51-43-02, 51-43-03, AND 51-21-03. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.