What was found
PILOT NOTICED OIL STREAMING FROM ATHE ENGINE COWLING DURING FLIGHT AND DECIDED TO FEATHER THE ENGINE BEFORE A CATASTROPHIC FAILURE OCCURRED. THE OIL DRAIN HOSE FROM THE AIR/OIL SEPARATOR IN THE WET VACUUM PUMP AND PRESSURIZATION SYSTEM SEPARATED WHICH DRAINS THE EXCESS OIL BACK INTO THE OIL SCAVENGE PUMP. THAT ALLOWED THE ENGINE OIL TO ESCAPE OUT THE BROKEN HOSE INTO THE ENGINE BAY. REPLACED THE HOSE WITH A NEW UNIT AND NO OTHER DISCREPANCIES WERE NOTED.