As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6321 - IAD-GSO - DURING TAXI, CREW SHUT DOWN RT ENGINE AND ACTIVATED NR 1 AND NR 2 FIRE BOTTLES DUE TO RT ENGINE SMOKING ON TAXI WHEN TESTING TTL SYSTEM. CREW EVACUATED PASSENGERS ON TAXI WAY. MAINTENANCE INSPECTED AND REMOVED AND REPLACED TTL BYPASS VALVE AND TWO ENGINE FIRE BOTTLES. MAINTENANCE GROUND RAN AIRCRAFT AND OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)