As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, EXPERIENCED SYSTEM A HYDRAULIC PRESSURE LOSS. AIRCRAFT RETURNED TO ONT AND MADE AN UNEVENTFUL LANDING. INSPECTED AND FOUND HYDRAULIC LINE TO RIGHT MAIN GEAR UPLOCK ACTUATOR RUPTURED. REPLACED LINE AND SERVICED SYSTEM PER BOEING M/M.