I have the same problem, apparently its the main board in the back of the fridge at the bottom and or the main PCB on the display on the freezer door, I've asked a few dealerships if they can advise which one and awaiting a responce, this site was useful for the service manual, not the same model but gives you an idea of where things are on the fridge: http://www.fixdevice.com/smanuals/file/37947.html
Hope this helps
Steve Aldridge, June 2011