As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT MADE A PRECAUTIONARY ENGINE SHUT-DOWN AND PROPELLER FEATHER DUE TO A PERCEIVED LOSS OF ENGINE OIL PRESSURE. THE FOLLOWING MAINTENANCE INSPECTION COULD NOT FIND ANY DEFECTS IN THE ENGINE OR OIL PRESSURE INDICATING SYSTESM. TWO GROUND RUNS AND A TEST FLIGHT WERE PERFORMED WITH NO DEFECTS NOTED.