Electric Window problems

I have a 2005 MY TF that has developed a problem with the electric window on the drivers side. The window powers down but will not power up. It's not the switch, that's been tested and it's not the power unit on the window regulator as I've by-passed the switch and it powers up. On the TF's upto chassis number 620548 there was a control unit which dealt with the window lift, from chassis number 620549 onwards the system changed does anyone know what replaced this unit and where to find it?

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