What was found
FLT 484 - ON APPROACH INTO PIT, FLIGHT CREW NOTED SMOKE IN COCKPIT BRINGING THE GEAR UP OR DOWN, BUT GOES AWAY IN-FLIGHT. AFTER LANDING IN PIT, THE FLIGHT CREW NOTED THE RELAY FOR THE CARGO DOOR HYDRAULIC POWER PACK HAD STUCK IN THE CLOSED POSITION ALLOWING THE HYDRAULIC PUMP MOTOR TO REMAIN ON AND OVER HEAT. A NEW LEACH RELAY P/N 7264-30B AND HYDRAULIC POWER PACK P/N 7-1261-5, WAS INSTALLED, NO OTHER DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. (X)