What was found
ENROUTE, THE PILOT NOTICED THE LANDING GEAR RELAY CIRCUT BREAKER WAS POPPED. THE FLIGHT CREW ALSO THOUGHT THEY COULD HEAR THE LANDING GEAR PUMP RUNNING BUT WERE UNSURE. AT ONE POINT IN THE FLIGHT THE HYD RESERVOIR LOW LEVEL LIGHT CAME ON BUT LATER EXTINGUISHED. ON ARRIVAL, THE CREW HAD TO MANUALLY EXTEND THE LANDING GEAR. ONCE ON THE GROUND THE CREW WAS ABLE TO DETERMINE THAT THE LANDING GEAR PUMP WAS RUNNING CONTINUOUSLY. MX FOUND THE LANDING GEAR PUMP MOTOR TO BE OPERATIONAL BUT EXTREMELY HOT. THE CAUSE OF THE CONTINUAL PUMP OPERATION WAS FOUND TO BE A STUCK RELAY. THE RELAY WAS REPLACED, THE LANDING GEAR PUMP MOTOR WAS REPLACED, NEW HYD FLUID ADDED TO THE RESERVOIR, THE SYS WAS OPERATIONALLY CHECKED AND THE ACFT RELEASED FOR SERVICE.