As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FORWARD SPINNER BOLT HOLES WERE 'DISHED' AT EACH HOLE LOCATION. AT ONE LOCATION, THE METAL ON THE BULKHEAD WAS SO THIN A CRACK HAD DEVELOPED THROUGH THE HOLE. SUBMITTER STATED OVERTORQUE OF THE PROP BOLTS WAS THE CAUSE OF THIS METAL STRETCHING. THE MM LISTS THE TORQUE FOR THE .50 INCH D-BOLTS IN THE SAME AREA AS THE 3 INCH D-BOLTS.