What was found
(CAN) A PROBLEM OF OIL ODOR IN CABIN WAS FIRST REPORTED ON A FLIGHT AND RE-OCCURRED. TROUBLE SHOOTING THE BLEED VALVE AND SWITCHING VALVES WERE REMOVED AND PRESENCE OF OIL WAS FOUND. THE ENGINE WAS CLEANED AND SERVICED AND A GROUND RUN PERFORMED DURING WHICH AN OIL MIST AND ODOR CAME INSIDE THE CABIN AND COCKPIT. THE AIRCRAFT WAS RETURNED TO THE HANGAR WHERE INSPECTION FOUND OIL AROUND ALL DIFFUSER PIPES. SUSPECTED IS AN OIL LEAK AT NR 5 BEARING, ENGINE WILL BE REMOVED AND FORWARDED FOR REPAIRS.