As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE TAXIING FOR DEPARTURE, CREW NOTICED A HYDRAULIC SYSTEM WARNING LIGHT AND A LOSS OF HYDRAULIC PRESSURE. THE A/C WAS TOWED BACK TO THE RAMP WHERE MAINTENANCE DISCOVERED THE NR 5 SLAT ACTUATOR HAD COME APART. THE ACTUATOR WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.