What was found
(CAN) ON FINAL, CREW SELECTED GEAR DOWN, GEAR UNLOCKED AND FAILED TO EXTEND, NO HYDRAULIC PRESSURE, AIRCRAFT DIVERTED TO QUEBEC AIRPORT, GEAR EMERGENCY EXTENDED, AIRCRAFT LANDED WITH NO FURTHER PROBLEM.FOUND LT ENGINE HYDRAULIC PUMP FUSELAGE LINE HAD A CHAFED HOLE FROM THE END ON A SCREW HOLDING A CLAMP. LINE REPLACED SYSTEM BLEED AND SERVICE, FOUND LT ENGINE HYDRAULIC PUMP FAILED, (SUSPECT RAN DRY), PUMP REPLACED, ALL HYDRAULIC SYSTEM CHECK SERVICEABLE, PRESSURE FILTER REPLACED. AIRCRAFT RETURNED TO SERVICE.