Had the line snap on me on the 1.5 Bullet in the same place: HOWEVER I had removed them and set them up to the same length again, and put them on back to front - brake lines to power and vis-versa. The power lines, (which were actually the brake lines), then snapped in a good wind. When I investigated I realised my error...
FYI the break lines on the Bullet have a white speckle in the sheaths at either end, whilst the power line sheaths are solid colour. Also the power line is slightly thicker: Hindsight is wonderful!!!
... Martin ...