As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO FIELD DUE TO A REPORT OF A SMOKEY/OILY ODOR IN THE CABIN. IN THE COCKPIT THE LAV SMOKE WARNING MESSAGES WERE DISPLAYED. MX WAS CALLED. MX CONFIRMED THE PRESENCE OF THE ODOR, BUT WAS UNABLE TO DUPLICATE THE PROBLEM WHILE RUNNING THE ENGINES. MX COULD NOT DUPLICATE. NO PARTS USED