As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ROTOR CONTROL NUT BACKED OFF OF BOLT P/N 0434 DISCONNECTING MAIN ROTOR PITCH CONTROL. SUBMITTER STATED NUT AND BOLT ASSY SHOULD BE DOUBLE-NUTTED OR DRILLED AND COTTER KEYED TO PREVENT SEPARATION. THERE ARE A TOTAL OF 4 OF THESE ASSEMBLIES IN THE CONTROL SYSTEM.