What was found
SEA FLIGHT NR 2399: ON APPROACH, WITH GEAR DOWN, CREW HEARD LOUD NOISE WHEN THEN NR 2 ENGINE HYD PUMP CAUTION LIGHT AND NOTICED NR 2 HYD QUANTITY DECREASING ON TAXI. HYD QUANTITY IN NR 2 WENT TO ZERO AND GOT MULTIPLE CAUTION LIGHTS. SHUT DOWN ENGINE 5-7 TIMES. MAINTENANCE FOUND HYD LINE (P/N 82920592-001) FAILED. INSTALLED FLEX LINE, REPLACED NR 2 HYD EDP, NR 2 PRESSURE FILTER MANIFOLD AND PRESSURE LINES FROM THE NR 2 HYD EDP TO THE PRESSURE MANIFOLD. NR 2 HYD SYSTEM POST MTX TEST CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.