As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENGINE FAILED TO START. HUNG START AFTER MOTORING FUEL FLOW WAS INTRODUCED AT 0.24 FOR 5-10 SECONDS THEN WENT TO ZERO. GROUNDED - YES. REMOVED AND REPLACED LEFT IGNITION EXCITER, LEFT IGNITER PLUG AND LEFT IGNITION LEAD ON #2 ENGINE PER B737-9 AMM 74-11-01 AND AMM 74-21-02 OPS CHECK GOOD. GROUND RUN VERIFICATION FOR #2 ENG START GOOD.