As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED UNCOMMANDED YAW AFTER TAKEOFF. RUDDER TRIM REQUIRED TO MAINTAIN CONTROL. RUDDER TRIM WAS TURNING TOWARDS FULL LEFT. CREW DECLARED EMERGENCY, DIVERTED AND LANDED SAFELY. PERFORMED OPS TEST OF RUDDER CONTROL SYS IAW AMM 27.21.00.710.801. OPS CHECK GOOD. PERFORMED OPS CHECK OF RUDDER TRIM IAW 27.21.00.710.802. OPS CHECK GOOD.