As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF HAD AN UN-COMMANDED ROLL TRIM TO THE LEFT AT FULL DEFLECTION. INITIALLY WE WERE UNABLE TO CORRECT THE TRIM TO NORMAL. EVENTUALLY WE WERE ABLE TO NEUTRALIZE THE ROLL TRIM. EMERGENCY DECLARED. R&R PILOT YOLK HAT SWITCH WITH NEW. OPS CHECK GOOD WITH NO FURTHER DEFECTS NOTED AT THIS TIME. WORK DONE IN REF TO AMM 22-13-00 AND WDM CH 27-01-01.