As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A TRAINING FLIGHT WHILE PRACTICING MANEUVERS, THE ELEVATOR TRIM POSITION MOVES INDEPENDENTLY WITHOUT INPUT FROM CREW; TENDS TO MOVE TO FULL NOSE DOWN POSITION. THE AIRCRAFT WAS CONTROLLABLE AND LANDED SAFELY. THE AIRFRAME OEM INSTRUCTED THE REPLACEMENT OF ELEVATOR TRIM ACTUATOR WITH IMPROVED VERSION REPORTED IN TECNAM SB-372-CS DATED 03/10/2020.