What was found
FLT 7710 - DAY-IAD - DURING TAKEOFF, EXPERIENCED A PROBLEM WITH THE LANDING GEAR NOT RETRACTING. FLIGHT CREW DECLARED AN EMERGENCY AND RETURNED TO DAY. AIRCRAFT LANDED WITH NO PROBLEM. MAINTENANCE CONTROL WAS NOTIFIED AND AIRCRAFT MAINTENANCE WAS DISPATCHED. MAINTENANCE TROUBLESHOT THE SYSTEM AND CONDUCTED NUMEROUS GEAR SWINGS IAW APPLICABLE MM PROCEDURES. MAINTENANCE COULD NOT DUPLICATE THE DISCREPANCY. AIRCRAFT WAS THEN RELEASED FOR SERVICE. (M)