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 THE LEFT HORIZONTAL STABILIZER RIB 12A CRACKED. MAINTENANCE REPIARED THE LEFT HORIZONTAL STABILIZER RIB 12A IAW EMB ETD 2013-170-003597-B REV B. MAJOR REPAIR, THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.