As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND LEFT WING RIB 10 EXTENSION CRACKED. MAINTENANCE REMOVED AND REPLACED RIB 10 EXTENSION LEFT WING IAW EMB 170 SRM 51-43-01, AND 51-43-02. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK. MAJOR REPAIR