As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT EN ROUTE FROM NGO TO ANC, RETURN TO NGO DUE TO "A" A/P UNSTABLE IN ROLL, PROGRESSIVELY ACTIVATED TO FULL AILERON DEFLECTION. "A" A/P ON DEFERRAL. REMOVED AND REPLACED A CHANNEL ROLL COMPUTER, TESTS GOOD ON THE GROUND PER 22-13-01