As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PROPELLER S/N HL271 WAS RETURNED FOR VIBRATION AND COMPLIANCE OF SB'S HD-SB-61-005, 014 AND 020. AFTER DISASSEMBLY, INSPECTION REVEALED THE A-4959 VESPEL BUSHING HAD COME LOOSE FROM THE PITCH CHANGE ROD BORE SEAT IN THE ENGINE SIDE HALF OF THE HUB. THE BUSHING WAS NOT DAMAGED, BUT WAS REMOVED WITH THE HYDRAULIC UNIT.