As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THE ENGINE THRUST SETTING CYCLED UNCOMMANDED ON TAXI. THE ACFT RETURNED TO THE GATE WHERE MX R & R THE NR 1 AIR DATA COMPUTER, OPERATIONALLY TESTED WITH NO DEFECTS NOTED, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.