As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PROPELLER SPINNER BULKHEAD CRACKING BETWEEN ATTACH BOLT HOLES IN (2) PLACES. CRACK COULD BE INDUCED FROM VIBRATION. INSPECT VISUALLY EVERY PRE-FLIGHT. A BETTER HEAT TREATING PROCESS MAY STRENGTHEN THE BULKHEAD AND REDUCE THE CRACKING FROM VIBRATION. (K)