As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YYC - CREW REPORTED LOSS OF HYDRAULIC PRESSURE. EMERGENCY DECLARED FLIGHT RETURNED YYC LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED RIGHT THRUST REVERSER CONTROL VALVE AND RUDDER SHUTOFF VALVE. SYSTEM GROUND CHECK NORMAL OPERATION.