As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT FELT BINDING IN TAIL ROTOR CONTROLS IN HOVER, MX IS TROUBLESHOOTING PROBLEM. REPLACED CSAS COMPUTER AND CSAS ACTUATOR PROBLEM WAS GONE FOR ABOUT 12 FLIGHT HOURS. PROBLEM RETURNED. THIS TIME WE FOUND THE SLIDING SLEEVE TO BE BINDING ON THE TAIL ROTOR SHAFT WHEN RADIAL FORCE WAS APPLIED TO THE SLIDING SLEEVE.