As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COCKPIT ODOR: DURING EACH DESCENT WHEN THE THROTTLES/POWER WERE REDUCED THE CREW NOTICED A HOT OIL SMELL. THE SMELL WAS THE STRONGEST WHEN THE THROTTLES WERE AT IDLE. ENGINE OIL LEVELS ARE NORMAL.// CORRECTIVE ACTION// REMOVED AND REPLACED CONDENSER BAG . PERFORMED ENGINE RUNS AND FOUND NO FOUL ORDR. REF CE-680 POH AND CE-680 AMM 21-21-03