As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT 2169 THE CREW REPORTED THAT THE BACK-UP TRIM WAS INOP IN FLIGHT. RETURNED TO CLE AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE HORIZONTAL STABILIZER CONTROL UNIT. ALL OPERATIONAL CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE.