As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, PILOT DISCONNECTED AUTO PILOT AND HAD TO HOLD FWD PRESSURE ON CONTROLS AND DETERMINED STABILIZER TRIM MOTOR WAS NOT OPERATING. PILOT SWITCHED FROM PRIMARY TO EMERGENCY TRIM MOTOR AND RETURNED TO THE AIRPORT. MX INSPECTED THE SYS AND COULD NOT DUPLICATE THE FAILURE. MX LUBRICATED THE ACTUATOR AND RETURNED THE ACFT TO SERVICE.