As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING PROPELLER DISASSEMBLY AT OVERHAUL, TWO COUNTERWEIGHT SLUG BOLT HEADS BROKE OFF. ONE WHILE REMOVING THE LOCKWIRE AND THE OTHER WHEN TRYING TO REMOVE THE BOLT FROM THE COUNTERWEIGHT. UPON FURTHER RESEARCH, THE TWO BROKEN BOLTS AND FOUR ADDITIONAL BOLTS ON THE PROPELLER ASSEMBLY WHERE INCLUDED IN THE FAA AD2009-10-14 AND HARTZELL ASB-313 REV 3, BUT WERE NOT REPLACED AS REQUIRED. (TC# 20180102009)