As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH, NR 1 HYDRAULIC ISOLATION VALVE CAUTION LIGHT ILLUMINATED ON THE CAUTION AND WARNING PANEL. FOLLOWED QRH AND PERFORMED A NO-BRAKE LANDING. EMERGENCY WAS DECLARED. LANDED SAFELY. FOUND NR 1 HYD SYSTEM FLUID NEARLY DEPLETED. SYSTEM SERVICED AND ACFT DISPATCHED. FLUID LOST AGAIN ON A SUBSEQUENT FLIGHT AND TROUBLESHOOTING FOUND LEAKING PRESSURE LINE. REMOVED AND REPLACED PER AMM 20-20-11. OPS AND LEAK CHECKED GOOD.