As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWO HOURS INTO FLIGHT HYD 3 ELEV OFF LIGHT ILLUMINATED CHECKED FLUID LEVEL IN 3 SYSTEM AND FOUND 4.7 GAL REMAINING. QUANTITY BLED DOWN TO 2.5 AND SYS 3 HYD SYST SHUT OFF LANDED IN PDX WITH LOSS OF ALL FLUID IN 3 WHEN GEAR CAME DOWN AND LOCKED. FOUND O-RING LEAKING AT THE NUMBER 3 SYS PRESSURE SENSOR.