As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAJOR REPAIR, WHILE AIRCRAFT WAS IN FOR HEAVY CHECK FOUND HORIZ STAB CRACKS ON LT SIDE RIB 11A AND 12A BETWEEN MID AND FRONT SPAR. THE CORRECTIVE ACTION AAR REPAIRED CRACKS, PER 170EO-55-10-0004. FOR DETAILS OF WORK PERFORMED SEE AAR NRC 4500812-3000-0012. AIRCRAFT HAS BEEN RETURNED TO SERVICE.