As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION OF AIRCRAFT FOLLOWING PILOTS COMPLAINT OF BURNING SMELL IN COCKPIT, AND OIL ON LOWER PART OF AIRCRAFT, REVEALED OIL LEAKING FROM THE BASE SEAM OF THE OIL FILTER. THE OIL LEVEL HAD GONE DOWN ONE HALF QUART IN THE ONE HOUR FLIGHT. THE LEAK WAS NOT FROM THE FILTERS BASE SEAL AND HAD BEEN PROPERLY TORQUED AND SAFETY WIRED IN PLACE. NO DAMAGE WAS VISIBLE ON THE FILTER.