As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL INSPECTION WHEN INSPECTING ENGINE CRANKSHAFT EXPOSED, NOTED THE 2 DOWEL HOLES IN THE CRANKSHAFT FLANGE HAD NO VISIBLE DOWELS INSTALLED. UPON PROPELLER REMOVAL FOR FURTHER INSPECTION, NO DOWELS WERE FOUND INSTALLED IN PROPELLER HUB. DOWELS WERE PROCURED AND INSTALLED AND SMOOTHER OPERATION NOTED WITH DOWELS INSTALLED.