What was found
DURING ENGINE 1 START SEQUENCE, ENGINE TOOK LONGER THAN NORMAL TO START. IGNITER USED WAS B, SWITCHED TO A DURING START. ENGINE APPEARED TO START NORMALLY, BUT GROUND CREW ANNOUNCED OVER HEADSET THAT THE AIRPLANE WAS ON FIRE AND TO EVACUATE THE AIRPLANE. WE COULD NOT COMMUNICATE FURTHER WITH GROUND CREW, SO ENGINE SHUTDOWN WAS ACCOMPLISHED INITIALLY WITH FUEL LEVER AND SUBSEQUENTLY FIRE HANDLE. ENGINE 1 FIRE BOTTLE WAS BLOWN DURING EVAC PROCESS. R & R NR 1 ENGINE ALL WORK ACCOMPLISHED IAW ENGINE CHANGE TASK CARD 71T0101-1. ENGINE RUNS COMPLETED. ALL CHECKS NORMAL.