What happened
While holding short for departure, the crew observed the #1 generator fault light illuminate. During the subsequent taxi back to the gate, the number one engine fire warning light also activated.
As smoke was seen emanating from the engine, the crew discharged both onboard fire bottles and secured the engine. The crew then ordered an emergency evacuation on the active taxiway using the right aft service door. All occupants were not injured during the evacuation.
The investigation
The investigation determined that the fire caused damage to the engine cowling and several accessories.