As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING DURING EMS MISSION, PILOT REPORTED ACFT WAS UNABLE TO SHUTDOWN WITH TWIST GRIP ON COLLECTIVE. MX ARRIVED, CONFIRMED LINKAGES CONNECTED CORRECTLY TO BOTH ENDS-AFTER REMOVAL, FLAT WIRE THAT MOVES INSIDE THE HSG WAS FOUND SEVERED ABOUT 4 FT AFT FROM TWIST GRIP.