As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG #1 FAILED TO LIGHT OFF. ABORTED ENGINE START L IGNITION USED FOR START ATTEMPT. GROUNDED - YES. PERFORMED TROUBLESHOOTING IGN IAW FIN74-21 TASK 806 REMOVED AND REPLACED IGNITER PLUGS L/H AND R/H OM ENG #1 IAW B737-900 AMM 74-21-02 AND PERFORMED IGNITION AUDIBLE TEST IAW AMM 74-00-00-750-801-F00 TEST OK.