There was that Japanese 135 which had a tail-rotor-driveshaft/control failure IIRC.
The important bit I remember was that it was a 135 which had no Autopilot fitted and the bit in the tail which gets replaced with another bit which allows the Autopilot to control the Fenestron had failed. So as long as you have the Autopilot fitted to the aircraft that particular failure shouldn't happen.
Does that make sense?