What was found
(CAN) AFTER TAKEOFF AT APPROXIMATELY 7000 FT, THE CREW REPORTED A MASTER WARNING ANNUNCIATION IN THE COCKPIT FOR LOW MOP ON ENGINE. THE CREW SECURED ENGINE, ACFT RETURNED TO DEPARTURE WHERE THEY PERFORMED AN UNEVENTFUL SINGLE ENGINE LANDING. TECH REPORTED HEAVY OIL LEAK FROM THE FWD CORE INTO BYPASS DUCT AND THE EXHAUST CONE. OIL IS ALSO NOTED ON THE COWLING. LARGE AMOUNT OF OIL ON GROUND AFTER LANDING.