As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NUMBER 539, AFTER PUSHBACK FROM GATE THE RIGHT ENGINE FAILED TO START. AIRCRAFT RETURNED TO THE GATE. MAINTENANCE REMOVED AND REPLACED THE NR 1 AND 2 IGNITOR PLUGS IN ACCORDANCE WITH M/M 74-21-02-04. THE AIRCRAFT WAS RETURNED TO SERVICE.