What was found
DURING FLIGHT, 'B' SYSTEM HYDRAULIC PUMP NR 2 PRESSURE INDICATION FLICKERING FOLLOWED BY DECREASE IN 'B' SYSTEM QUANTITY. CREW DECLARED AN EMERGENCY AND PERFORMED HYDRAULIC FLUID/SYSTEM LOSS CHECKLIST. JETTISONED 6900 POUNDS OF FUEL AND RETURNED TO MSP WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED HYDRAULIC LINES 155 AND 160 IN THE ILLUSTRATED PARTS CATALOG REFERENCE 29-14-00 FIGURE 6 AND 'B' SYSTEM PUMP AND FILTERS. OPERATIONAL AND LEAK CHECK NORMAL.