As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED MAIN AND BACKUP PITCH TRIM FAILURE. MAINTENANCE COMPLIED WITH ENT AND FAULT ISOLATION MANUAL AND REMOVED AND REPLACED THE HORIZONTAL STABILIZER CONTROL UNIT IAW MM. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (K)