As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAAFT RETURNED TO THE GATE, AFTER PUSH BACK, DUE TO A HYDRAULIC LEAK AT THE L/H MAIN LANDING GEAR DOWNLOCK ACTUATOR SUPPLY FLEX LINE. LINE WAS FOUND RUPTURED AT MID POINT. LINE WAS REPLACED AND AIRCRAFT WAS RETURNED TO SERVICE.