As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW REPORTED JUST PRIOR TO LEVELING AT FL250, THE NR 1 EADI (UPPER PILOT WAS FLAGGED WITH "ATITUDE FAIL" .SUBSEQUENTLY, THE FLIGHT DIRECTOR AND AUTOPILOT KICKED OFF LINE.CREW SELECTED NR 2 AHRS AND FLIGHT CONTINUED UNEVENTFULLY TO THE NEXT DESTINATION. ON THE SUBSEQUENT START THE NR 1 AHRS WAS RESELECTED WITH NO PROBLEMS. FAILURE COULD NOT BE DUPLICATED.