As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON DESCENT FLIGHT CREW RECEIVED A NR 2 HYD ISO VALVE CAUTION MESSAGE & OBSERVED A LOW QTY OF HYD FLUID IN THE NR 2 SYS. AN EMER WAS DECLARED, AN ALTERNATE GEAR EXTENSION PERFORMED & ACFT LANDED WITHOUT FURTHER INCIDENT. FOUND THE LT OTBD ROLL SPOILER ACTUATOR CASING FRACTURED. THE ACTUATOR WAS REPLACED, LEAK CHECKED & TESTED SERVICEABLE. THE ACFT RETURNED INTO SERVICE.