As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6381 - IAD-CMH - DURING CRUISE FLIGHT, MADE AN UNSCHEDULED LANDING WITH ONE DISCREPANCY WHICH WAS FLIGHT OFFICERS ADI GYRO FLAG ILLUMINATED. AIRCRAFT WENT TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE REMOVED AND REPLACED ADI, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (M)