As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A 100 HOUR INSPECTION OF THE PROPELLER IT WAS NOTICED THAT THERE WERE CRACKS AROUND THREE OF THE BOLT HOLES OF THE FORWARD SPINNER BULKHEAD. THE PROBABLE CAUSE IS THAT DURING THE TORQUING PROCESS THE BULKHEAD IS BEING STRESSED AND BENT AS IT IS PULLED TIGHT TO THE PROP HUB. IT IS SUGGESTED THAT THE SPINNER BULKHEAD BE MADE OF THICKER MATERIAL.