As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATTEMPTED #2 ENGINE START ON IGN L WITH NO START, ABORTED START, SWITCHED TO IGN R WITH NORMAL START. GROUNDED - YES. FOUND DAMAGE ON # 2 ENG L IGNITER PLUG. REMOVED AND REPLACED PLUG REF B737-900 AMM 74-21-02. OPS CK GOOD. # 2 ENG STARTS NORMAL WITH SWITCH IN IGN L POSITION. GROUND VERIFICATION SUCCESSFUL.