As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/PHI - FLT 7652 - DURING TAXI AT 0700, AIRCRAFT LT ENGINE FLAMED OUT DURING MORNING TTL TEST. AIRCRAFT WAS EVACUATED ON THE RUNWAY. MAINTENANCE REMOVED AND REPLACED LT TTL VALVE AND TTL CONTROLLER. RUN-UP OKAY. AIRCRAFT RELEASED AND RETURNED TO SERVICE. (X)