As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH CHANNELS 'A' AND 'B' UNCOMMANDED ROLL TO RIGHT. CHANNEL 'B' HAD TO MANUALLY OVERRIDE ROLL. ON GROUND ENGAGED AILERON GOES INTO RIGHT TURN, KNOB MUST BE TURNED FULL LEFT TO LEVEL AILERON. REPLACED AUTOPILOT ROLL COMPUTER, PASSED SELF TEST.