What was found
ON DECENT, CREW REPORTED NR 1 HYD QTY INDICATING ABNORMALLY LOW AND SOON AFTER THEY RECEIVED A NR 1 HYD PUMP CAUTION LIGHT. ALSO RECEIVED A FLAP POWER CAUTION LIGHT AFTER ATTEMPTING TO SELECT FLAPS 5. RAN QRH CHECKLIST, DECLARED AN EMERGENCY. LANDED WITHOUT INCIDENT. MX INSPECTED AND FOUND THE LEAK COMING FROM BALANCE RELIEF VALVE. R & R THE NR 1 SYS ENGINE DRIVEN PUMP, SYS FILTERS AND THE NR 1 SYS PRIORITY VALVE, BALANCE VALVE IAW AMM. ACFT IS GOOD FOR SERVICE.