As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A ROUTINE MAINTENANCE VISIT WHILE PERFORMING PHASE A AND PHASE B INSPECTIONS A CRACKED RIB WAS DISCOVERED ON THE LEFT HORIZONTAL STABILIZER AT THE LEFT ROLLER ASSEMBLY. THE RIB WAS REPLACED ALONG WITH SUPPORT BRACKETS. THE AIRCRAFT WAS RETURNED TO SERVICE.