What was found
HYD 2 QTY LOW LVL 2 ALERT FOLLOWED BY HYD 2 OFF LVL 2 HYD QTY WENT TO 0. LANDED LAX WITHOUT INCIDENT. INSPECTED HYD FILTERS ON ENGINE FOUND AFT PUMP CASE DRAIN FILTER HAD LARGE QUANTITY OF METAL DEBRIS & DELTA P INDICATOR POPPED. FOUND SHAFT SHEARED ON AFT HYD PUMP. R & R AFT HYD PUMP, REQUIRES LEAK & OPS CHECK PER AMM 29-11-20-4 2. INSPECTED NR 2 HYD SYS FILTERS FOR CONTAMINATION, NO CONTAMINATION FOUND. R & R FWD EDP PER AMM 29-11-20-4 2. NO METAL FOUND AFTER FLUSH. CHANGED HYD FILTERS PER AMM 29-12-41-2 RAN ENGINE TO IDLE PER JRH RESERVICED RESERVOIR PER AMM 12-12-02-600-801 CHANGED FILTERS AGAIN, NO CONTAMINATES FOUND IN EITHER ENGINE FILTERS OR SYSTEM FILTERS. RECHECKED HYD QTY, CHECKED GOOD.