As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON ENGINE START UP AND TAXI THE PILOT NOTICED THE FLIGHT COMMAND INDICATOR NOT RESPONDING TO THE ACFT MOVEMENT. THE ACFT RETURNED TO THE BLOCKS AND MAINTENANCE REPLACED THE UNIT WITH AN O/H UNIT. THE SYSTEM FUNCTION CHECKED SERVICEABLE.