What was found
LAS - AIR TURNBACK - FLT 870 - "C" - DURING CLIMB OUT OF LAS THE # 2 ENG "B" SYSTEM HYD PRESS. LIGHT STARTED FLICKERING AND THE "B" SYSTEM HYD QUANTITY DECREASED TO 1/4 FULL. THE CREW SHUT OF THE "B" SYSTEM HYDRAULICS AND RETURNED TO LAS MAKING AN UNEVENTFUL LANDING. MAINTENANCE FOUND THE "B" SYS ELECTRIC HYD PUMP PRESSURE HOSE HAD RUPTURED IN THE R/H MAIN LANDING GEAR WHEEL WELL. MAINTENANCE REPLACED THE LINE, SERVICED THE "B" SYSTEM HYDRAULICS AND PERFORMED LEAK CHECKS. NO FURTHER DISCREPANCIES HAVE BEEN REPORTED.