As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNCOMMANDED TRIM IN FLIGHT, ON GROUND. ELEVATOR TRIM GOING UP AND DOWN AND SPLIT. REFERENCE DAYJET WORK ORDER 1299, NRI 1 AND 3. REFERENCE TSR 22-020608G AND NRI 1 FOR RUDDER TRIM ACTUATOR REPLACEMENT. REMOVED AND REPLACED RUDDER TRIM ACTUATOR WITH NEW ACTUATOR IAW EA500 AMM 27-23-16. PERFORMED OPERATIONAL CHECK OF RUDDER TRIM ACTUATOR IAW EA500 27-00-01. OPS CHECK GOOD.