What was found
IN CRUISE FLIGHT ATL-DHN AT 18,000 FEET, EMERGENCY BUS OFF LIGHT ILLUMINATED AND AIRCRAFT LOST ALL EMERGENCY DC BUS 1 POWER. ALL AUXILLARY AND MAIN GENERATORS CONTINUED TO OPERATE NORMALLY. CREW DECLARED AN EMERGENCY, INITIATED A DESCENT TO GET OUT OF ICING, AND RETURNED TO ATL WHERE LANDING WAS MADE SAFELY AND WITHOUT INCIDENT. REMOVED AND REPLACED THE EMERGENCY DC BUS 1 CIRCUIT BREAKER. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RELEASED FOR SERVICE. (M)