As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL FITLER ADAPTER SEPARATED FROM ENGINE AT CRANKCASE COVER MOUNTING BOSS ALLOWING OIL SUPPLY TO BE EXHAUSTED. INVESTIGATION REVEALED 80 PERCENT OF THE MOUNTING THREADS CONTAINED IN THIS BOSS WERE STRIPPED. HIGH TEMP RTV WAS FOUND ON THESE THREADS AS WELL AS THE THREADS OF THE OIL FILTER ADAPTER. THE TCM OVERHAUL MANUAL DOES NOT CALL FOR SEALER IN THIS AREA.