What was found
ABORTED ENGINE START #1 DUE TO NO LIGHT OFF ON THIRD ATTEMPT; CABIN CREW (F.O.) NOTED FIREBALL AND SMOKE IN TAILPIPE INSPECTED #1 ENGINE PER FIM 71-05 TASK 811 NO FAULTS NOTED. PERFORMED #1 EEC BITE PER AMM 73-21-00 TEST PASSED. LEFT IGNITION INOP OK TO CONTINUE PER MEL 74-1-02 SP#1 <[01]. INSPECTED #1 ENGINE PER FIM 71-05 TASK 811; NO FAULTS NOTED. PERFORMED #1 EEC BITE PER AMM 73-21-00; TEST PASSED. LEFT IGNITION INOP #1 ENGINE. OK TO CONTINUE PER MEL 74-1-02 SP#1; [02] REMOVED AND REPLACED L/H MAIN IGNITER PLUG PER AMM 74-21-02 NO FIX.REMOVED AND REPLACED L/H IGNITION LEADS PER AMM 74-21-01 NO FIX.REMOVED AND REPLACED L/H IGNITION EXCITER PER AMM 74-11-01 OPS CHK GOOD.