What was found
ON CLIMB OUT OF KSEA APPROX. FL190 #2 HYD ISO VLV MASTER CAUTION, THEN #2 ENG HYD PUMP, THEN #2 RUD HYD MASTER CAUTIONS ILLUMINATED IN SEQUENCE. #2 HYD QTY INDICATED 10% #2 HYD PRESS INDICATED 0 PSI PERFORMED #2 ENG HYD PUMP CAUTION E&A CHECKLIST, THEN #2 HYD SYSTEM FAILURE LANDING CHECKLIST, THEN ALTERNATE GEAR EXTENSION. RETURNED TO FIELD, LANDING UNEVENTFUL. REMOVED FROM SERVICE. REPLACED ENGINE DRIVEN PUMP & REPAIRED DAMAGED HYD LINE. OPS & LEAK CHECKS GOOD. RETURNED TO SERVICE.