What was found
(CAN) -DURING APPROACH PILOT SELECT GEAR DOWN. THEN PILOT NOTICE MANY CAUTION LIGHTS: SPOILER, ISOVALVE, STEERING AND HYD TANK NR 2 LEVEL EMPTY. BUT GEAR LOCK DOWN OK 3 GREEN LIGHTS. AIRCRAFT LAND NORMALLY AND SAFELY. MAINTENANCE FOUND ALUMINIUM HYDRAULIC LINE FOR LANDING GEAR DOWN PRESSURE CRACK IN A RADIUS (LINE IS IN THE WING TO FUSELAGE BOX)(CRACK LOOKED LIKE A FATIGUE CRACK). LINE REPLACED SYSTEM SERVICED, NO MORE LEAK.