As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/GSO - FLT 6321 - DURING TAXI AT 1035 HOURS ON 8-19-97, RETURNED TO GATE WITH NO FURTHER PROBLEMS EXCEPT THE CAPTAIN'S ADI TUMBLED DURING TAXI. MAINTENANCE INSPECTED AND REMOVED AND REPLACED ADI, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (X)