What was found
#2 ENG FAILED TO LIGHT OFF DURING STARTING START SWITCH WAS IN "L". GROUNDED - YES. CONFIRMED FAULT, #2 ENGINE L-IGNITION INOP. FOUND IGNITER LEAD DEFECTIVE. REMOVED & REPLACED IGNITION LEAD REF B737-800 AMM 74-21-01 AND REPLACED M421 LEFT IGNITION EXCITER AND MAIN IGNITER PLUG (L) AS PRECAUTIONARY REF AMM 71-11-01 & AMM 74-21-02, OPS CK NML. PULLED & RESET 2 TOTAL C/BS. AIRCRAFT RELEASED FROM MEL 74-1C, C/N 05039579. SEAMC NOTIFIED "JARRETT." REVERSAL OF CONFIGURATION CHANGES NOT REQUIRED.