As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENGINE NEGATIVE IGNITION ON TWO STARTS WITH LEFT IGNITER SELECTED. GROUNDED - YES. LEFT IGNITOR PLUG REPLACED REF B737-9 AMM 74-21-02. LEFT IGNITION EXCITER REPLACED, REF AMM 74-11-01. PERFORMED TEST OF IGNITOR SYSTEM - SAME PASS-REF AMM 71-00-00. ENG RUN OF #2 ENG COMPLETED SUCCESSFULLY REF AMM 71-00-01B.