As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE IN CABIN SMOKE ODOR ON FLIGHT DECK SMOKE WAS VISIBLE TOWARD FRONT OF CABIN SMOKE AND ODOR DISSIPATED AFTER RUNNING CHECKLIST. RETURNED TO FIELD. LANDING UNEVENTFUL. REMOVED FROM SERVICE. VERIFIED NR 1 AND 2 OIL LEVELS , NR 2 P2.7 VALVE FILTER FOR OIL, NR 1 AND 2 P2.2 DUCTS FOR PRESENCE OF OIL. NO DEFECTS NOTED. COULD NOT DUPLICATE. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.