What was found
IAH- DURING TAXI, FLIGHT 3585, THE EMERGENCY LIGHT (NOT ARMED LIGHT ON THE MAP)CAME ON WHEN THE SWITCH IS IN THE ARMED POSITION. IAH- MAINTENANCE REMOVED AND REPLACED RELAY K201, PERFORMED A OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM, NO DEFECTS NOTED, AND, THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.