U-Mix Control Pro Crossfader Broken!

Hello everyone. My Control Pro is a few years old but i have hardly used it. Its been working fine USB connected to my MacBookPro then all of a sudden the crossfader stopped responding. Checked the MIDI signal and its not sending consistent signal. Its definately a hardware issue. Anyone know what model the Cross fader is to replace and where i can get one from? Mixvibes dont seem to be able to help rather referring me to post on here - caroline.quero@mixvibes.com
thanks all
thanks all