As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - DURING CLIMB THE FLIGHT CREW REPORTED THAT THE MAIN PITCH TRIM WAS INOPERATIVE. THE AIRCRAFT RETURNED TO IAH AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE HORIZONTAL STABILIZER CONTROL UNIT TO CORRECT THE DISCREPANCY.