As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT DURNG CRUISE THE MAIN PITCH TRIM WAS INOP. THE ACFT RETURNED TO DEPARTURE WHERE IT KANDED WITHOUT INCIDENT. MX REMOVED AND REPLACED THE HORIZONTAL STABILIZER CONTROL UNIT, OPS TESTED WITH NO DEFECTS, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE