As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE TAXIING FOR TAKEOFF, FLIGHT CREW OBSERVED HYDRAULIC NR 1 QTY DROPPING FAST. RETURNED TO THE GATE AND HYD FLUID WAS LEAKING FROM RT WING. MAINTENANCE FOUND THAT RT INBD SPOILER ACTUATOR ENDCAP WAS BROKEN. ACTUATOR REPLACED IAW AMM 27-14-05. ACFT RETURNED TO SERVICE.