As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT WHILE ENROUTE, OBSERVED THE NR 1 HYDRAULIC QUANTITY DROP TO ZERO OVER A FEW SECONDS. LANDED WITH NO INCIDENT USING MANUAL GEAR EXTENSION AND OUTBOARD SLATS. MAINTENANCE FOUND A LEAKING HYDRAULIC HOSE IN THE REAR COMPARTMENT. FAULTY HOSE WAS REPLACED WITH A NEW UNIT, WAS SERVICED AND LEAK CHECKED GOOD. AIRCRAFT WAS RETURNED TO SERVICE.