What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE REPLACED RIGHT WING RIB 10 CRACKED. MAINTENANCE REMOVED AND REPLACED THE RIGHT WING RIB 10 IAW EMB ETD 2011-170-01728, EMB 170 SRM 51-40-02, 51-43-01, AND 51-43-02. "MAJOR REPAIR" THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.