As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TAXING FOR TAKEOFF, FLIGHT CREW NOTICED THEY HAD LOST NR 1 HYD SYSTEM PRESSURE. DECISION WAS TAKEN TO SHUTDOWN THE LT ENGINE AND TO RETURN TO GATE. MAINTENANCE FOUND THE RT INBD ROLL SPOILER ACTUATOR CASING FRACTURED. THE ACTUATOR WAS REPLACED, TESTED AND THE ACFT RELEASED INTO SERVICE.