As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/ROA - FLT 6591 - DURING TAXI AT 0923 HRS ON 10-20-97, AIRCRAFT RETURNED TO GATE DUE TO LT DUCT OVERTEMP AND AIR-OFF WARNING LIGHT ILLUMINATED. MAINTENANCE INSPECTED AND OPENED DMI 06950, MEL 21-1. MAINTENANCE CLOSED DMI 06950 ON 10-21-97 BY REMOVING AND REPLACING CENTRAL ANNUNCIATOR. AIRCRAFT RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)