What was found
DURING DESCENT BEFORE GEAR EXTENSION, EXPERIENCED NR 2 HYD ISOLATION VALVE CAUTION WHILE RUNNING THE CHECKLIST NOTED 15 PERCENT NR 2 HYD QTY REMAINING. ACCOMPLISHED ALT GEAR EXTENSION IAW CHECKLIST AND MADE A NORMAL LANDING.SHUTDOWN AT GATE AND PINNED GEAR. ENG HYD LIGHTS DID NOT ILLUMUINATE, 5 PERCENT QTY REMAINING AT GATE. INSPECTED & FOUND NR 2 EDP LEAKING. R & R NR 2 EDP IAW AMM TASK 29-11-01-000-801, 29-11-01-400-801, & MCN 5114929232/1. C/W SIMPLFIED FLUSH OF THE NR 2 HYD SYS IAW TR-29-188 AMM TASK 29-10-00-617-803 PARA C. EDP OPS CHECKS GOOD. NO LEAKS NOTED. DEFERRED FULL FLUSH. RETURNED TO SERVICE.