As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) JUST AS AC STARTED TO TAXI CREW NOTED LOSS OF ALL HYD FLUID IN SYSTEM A. A/C SHUT DOWN AND PUSHED BACK INTO PARKING SPOT. LEAK DETERMINED TO BE COMING FROM THE RT MLG DOOR SEQUENCE VALVE. BODY OF VALVE FOUND SPLIT. A/C UNLOADED, VALVE CHANGED, GEAR SWINGS CARRIED OUT AND A/C RETURNED TO SERVICE.