What was found
(CAN) FLIGHT TAXIED TO GATE. WHILE ENGS WERE OFF AT GATE, CREW OBSERVED A 3S FIRE INDICATION. THIS OCCURRED 3 TIMES, DURING 3RD EVENT, CREW WAS PREPARED TO FIRE THE BOTTLE. CREW OBSERVED NO PHYSICAL SMOKE OR FIRE FROM NR 1 ENG, NO BOTTLE WAS FIRED. PAX DISEMBARKED NORMALLY. AFTER A FEW MINUTES, CREW NOTICED AN ODD BURNING SMELL THROUGH THE MAIN CABIN DOOR. FIRE DEPARTMENT WAS CALLED TO THE GATE. LOCAL MTC OPENED COWLS & NOTICED NOTHING EXCEPT OIL & BLACK MARKINGS NEAR THE STARTER. RESOLUTION TROUBLESHOOT IAW FIM 26-11-00-810-807-A. REPLACED GEN I O CARD, SLOTS 9 & 10 MAU 3 IAW AMM 31-41-06 PB401.