As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND DOWEL FOR CRANKSHAFT SPLINE BUSHING IN SUMP AT OIL SCREEN. UPON TEAR DOWN FOUND ONLY 1 OF 3 DOWELS STILL IN CRANKSHAFT. BUSHING WAS STARTING TO TWIST IN BETWEEN CRANKSHAFT AND SPLINE BUSHING. NO OTHER INDICATION OF PROBLEMS. ENGINE RAN GOOD, FILTER WAS CLEAR.