What was found
(CAN) AFTER TAKEOFF FROM TORONTO AS FLAPS WERE RETRACTING FROM 1 TO UP, CENTRE HYDRAULIC QUANTITY AND C HYDRAULIC SYSTEM PRESSURE DISPLAYED EICAS MESSAGES / CAUTIONS AND HYDRAULIC PRESS LIGHTS ANNUNCIATED, THE AIRCRAFT RETURNED TO TORONTO USING ALTERNATE FLAPS/GEAR EXTENSION.FOUND AIR DRIVEN PUMP PRESSURE LINE COUPLING BROKEN.REPLACED ADP PRESSURE LINE COUPLING, CASE DRAIN FILTER CHECKED FOR CONTAMINATION AND FOUND CLEAN. SYSTEM LEAK CHECKED AND OPERATIONAL CHECK ALSO CARRIED OUT, AIRCRAFT FOUND SERVICEABLE.