As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, FLIGHT CREW NOTICED UNCOMMANDED ROLL TRIM DEFLECTION. CREW DECLARED EMERGENCY AND RETURNED TO DEPARTURE AIRPORT. MAINTENANCE DETERMINED LEFT ROLL TRIM ACTUATOR DEFECTIVE. REPLACED LEFT ROLL TRIM ACTUATOR AND OPERATION CHECKED GOOD.