As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD PROPELLER SPINNER BULKHEAD CRACKED AROUND RADIUS OF SHOULDERED WASHERS. THIS IS POOR DESIGN AS THE BULKHEAD IS NOT FLAT AT OUTER RADIUS OF WASHERS. THIS HAS BEEN THE TWELFTH BULKHEAD REPLACED ON THIS TYPE AIRCRAFT IN THE PAST YEAR AT THIS REPAIR STATION. SOME HAVE BEEN FOUND CRACKED WITH LESS THAN 100 HOURS.