As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED APPEARANCE OF SMOKE IN COCKPIT AT TOUCHDOWN. REPORTED AS POSSIBLY COMING FROM BLEED AIR, OILY SMELL. CORRECTED AN OIL LEAK AT THE LT OIL COOLER INBD FITTING & REPLACED O RING AT FITTING, CLEANED DUCTING AS REQUIRED. OIL LINE AT LEAKING FITTING WITH THIS O RING WAS REMOVED & REINSTALLED 13.3 FLIGHT HOURS PRIOR, FOR OTHER MX.