As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENG LH ING INOP DURING ENGINE RUN FOR OIL SVC. GROUNDED - YES. REF B737-800 FIM 74-21-TASK 806, PERFORMED AUDIBLE IGNITER TEST. LH IGN SOUNDED FAINT. RH TESTED NORMAL. REMOVED AND REPLACED LH IGNITION LEAD REF B737-800 AMM 74-21-01. AUDIBLE TESTED NORMALLY. PERFORMED ENGINE RUN OPS CHECK NORMAL.