As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6205 - IAD-MHT - DURING TAXI, NOTICED EMERGENCY TRACK LIGHTING INOP. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED POWER SUPPLY. OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)