What was found
(CAN) DURING DESCENT AFTER RETARDING POWER LEVERS, FLIGHT CREW RECEIVED AN OILY ODOR AND THE LAVATORY SMOKE DETECTOR SOUNDED. THE LAVATORY WAS CHECKED BUT THERE WAS NO SIGN OF SMOKE. AFTER TURNING THE NR 2 BLEED SYSTEM OFF, THE ODOR DISSIPATED. FLIGHT LANDED WITHOUT FURTHER INCIDENT AND WAS ESCORTED TO THE GATE BY LOCAL EMERGENCY RESPONSE SERVICES. LOCAL MAINTENANCE CONFIRMED OILY ODOR ORIGINATED FROM THE NR 2 BLEED AND THE ACFT WAS FERRIED TO A MAIN BASE ON A SPECIAL PURPOSE FLIGHT PERMIT. DURING TROUBLESHOOTING, TRACE OF OIL WAS NOTED IN THE ENGINE INTAKE IN FRONT OF THE COMPRESSOR INLET. THE ENGINE IS CURRENTLY BEING REPLACED.