As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATION REPORTED BY PILOT. OPERATOR WAS UNABLE TO DYNAMIC BALANCE. OPERATOR NOTICED ONE BLADE HAS ROTATIONAL PLAY. UPON DISASSEMBLY NR 2 BLADE LINK BUSHING P/N A4564 WAS FOUND CRACKED WITH PIECES MISSING. THE LINK P/N B4743 AND BLADE ACTUATING PIN P/N B5072-1 WERE DAMAGED FROM METAL TO METAL CONTACT.