As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, CREW OBSERVED STEADY HYDRAULIC FLUID LOSS IN SYSTEM NR 4. HYDRAULIC LOSS CONTINUED TO .67 WITH SYS DEPRESSURIZED. AFTER INSPECTION , MAINTENANCE NOTED NO FLUID LOSS IN NR 4 SYSTEM. QTY WAS FULL AFTER ACFT LANDED. MAINTENANCE FOUND THE PNEUMATIC HEAD PRESSURE LINE TO THE NR 4 RESERVOIR LEAKING. THE LINE WAS REPLACED AND THE NR 4 HYD QTY INDICATION FOR THE NR 4 SYS WAS DEFERRED. A NEW QTY TRANSMITTER WAS ORDERED FOR THIS.