As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAXI OUT FROM THE GATE, FLIGHT CREW OBSERVED THE HYDRAULIC SYSTEM NR 1 FLUID LEVEL DEPLETING. THE ACFT RETURNED TO THE GATE. ON-SITE MAINTENANCE FOUND THE LEFT INBD ROLL SPOILER ACTUATOR CASING FRACTURED. THE ACTUATOR WAS REPLACED, LEAK CHECKED AND TESTED SERVICEABLE. THE ACFT RETURNED INTO SERVICE.