As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE FROM MKE THE CREW NOTED THAT WHEN THE AUTOPILOT WAS COUPLED TO THE NR 1 FLIGHT DIRECTOR THE AILERONS SEEMED TO, TWITCH, NOT MOVE SMOOTHLY. EVERYTHING WAS NORMAL WHEN COUPLED TO NR 2 FLIGHT DIRECTOR. CREW RETURNED TO MKE. TROUBLESHOT TO AUTOPILOT COMPUTER. REPLACED AUTOPILOT COMPUTER WITH OVH UNIT, OPERATIONS CHECKED GOOD.