What was found
LGA - FLT 4778 - AFTER TAKEOFF FROM LGA, THE CREW NOTED SMOKE IN THE COCKPIT. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO LGA LANDING WITHOUT INCIDENT. MAINTENANCE INSPECTED THE COMPLETE COCKPIT AREA AND PERFORMED ELECTRICAL CHECKS OF ALL SYSTEMS WITH NO DEFECTS NOTED AND NO ODOR PRESENT. ALL ELECTRICAL CHECKS WERE NORMAL. AN INSPECTION OF THE EQUIPMENT BAY BELOW THE COCKPIT REVEALED A COFFEE SPILL. THE AREA WAS CLEANED AND THE AIRCRAFT RELEASED TO SERVICE. (M)