It was a clean break of the control cable just forward of the helix drum around which it wraps in the tail rotor assembly.
Please bear in mind that I am not qualified in the engineering department however as far as I could see there seemed to be no signs of wear and tear, and the operator informed me that it was only six months old. The break was so clean that it looked like it had been cut.
I have a picture of it if you're interested.
McHover