As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIMARY STAB TRIM FAIL ON CLIMB OUT. CREW ACTIVATED SECONDARY TRIM AND RETURNED FOR LANDING. REMOVED AND REPLACED THE HORIZONTAL TRIM ACTUATOR AND HORIZONTAL TRIM ACTUATOR CONTROL UNIT IAW 680 AMM 27-40-00, OPERATIONAL AND TRAVEL CHECK GOOD.