What was found
MOB- FLIGHT 3953, DURING TAXI THE CREW NOTED A ELECTRIC SMOKE SMELL IN THE COCKPIT AND RETURNED TO THE GATE. MOB- MAINTENANCE POWERED UP THE AIRCRAFT, STARTED BOTH ENGINES, CYCLED ENVIRONMENTAL SYSTEM, CYCLED ALL ELECTRICAL SYSTEMS, CYCLED FLIGHT CONTROLS, COULD NOT DUPLICATE THE SMELL AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.