As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TPE - LOST NR 3 HYDRO SYSTEM, FLUID QUANTITY WENT DOWN TO 2.8. SERVICED NR 3 HYDRO SYSTEM TO 8.5 GALLONS. TROUBLESHOT AND RAN ENGINES. NO LEAK NOTED. (SUSPECT AIR BLEED VALVE PLUNGER MAY HAVE STUCK OPEN.) EXCERISED PLUNGER AND OPS. CHECK NORMAL.