As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ACFT DEPARTED AT ABOUT 1530Z. IN FLIGHT, THE CREW HAD LOST HYD QTY, DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE. ACFT WAS TOWED TO RAMP AND MAINTENANCE DISCOVERED A HYD LEAK COMING FROM THE LT NACELLE AREA. MAINTENANCE FOUND A CHAFED PRESSURE HYD LINE IN THE LT NACELLE. HYD LINE WAS REPLACED, HYD PUMP REPLACED, HYD FILTERS INSPECTED. LEAK CHECK CARRIED OUT AND CHECKED SERVICEABLE.