As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED ACFT ROLLED RT SUDDENLY WITH AUTOPILOT ON. ALSO FELT SOME BUFFETING. THE AUTIOPILOT WAS TURNED OFF AND ACFT FLEW WITHOUT ANY FURTHER INCIDENT. MAINTENANCE INSPECTED AND PERFORMED OPS CHECKS . NO FAULTS WERE FOUND. MAINTENANCE REPLACED THE NR 1 IC-600 COMPUTER AND NR 1 AHRS COMPUTER FOR PRECAUTIONARY PURPOSES. OPS CHECKS WERE GOOD. THE ACFT RETURNED TO SERVICE.