What was found
(CAN) DURING TAXI, A PASSENGER NOTICED A SMALL AMOUNT OF SMOKE / FIRE COMING UP FROM THE FLOOR NEXT TO THE MAIN CABIN DOOR AND POINTED IT OUT TO THE FLIGHT ATTENDANT WHO IMMEDIATELY NOTIFIED THE PILOTS. THE FIRE WAS APPROXIMATELY 1 INCH HIGH AND WAS LOCATED AT THE MAIN CABIN DOOR HINGE ARM WHERE THE MAIN CABIN DOOR LIGHT WIRES COME OUT OF A CONDUIT. THE PILOT GOT THE FIRE EXTINGUISHER FROM THE COCKPIT AND PUT OUT THE FIRE. THE PILOT THEN ORDER TO THE PASSENGERS TO EXIT OUT THE REAR AIRSTAIR DOOR. THE CIRCUIT BREAKER FOR THE AIRSTAIR DOOR LIGHTS DID NOT TRIP. MFG IS INVESTIGATING THE EVENT.