As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) LEFT INBOARD GEAR DOOR ACTUATOR BOTTOM GT RING. THE O-RING AND BACK-UP FAILED. THIS CAUSED THE ALL HYDRAULIC FLUID LOSS. EMERGENCY GEAR EXTENSION USED. CAUSE OF O-RING FAILURE WAS A PAINT CHIP ON INSIDE OF THE O-RING AND BACK-UP RING.