Hi there. I was onto Allen in road pro about this today. Mine is still working but was checking just in case. There are two types of tuner in the control box. If it's the short one you need to take the top off the dome, send him a pic, take out the card from the dome( they will tell you how) and send the card and the box to him. 40 quid. However if it's the long silver tuner as opposed to the short one, then the iud? And controller thingy need changing. 700 quid. Was I praying when I opened mine to see. My prayers were answered thankfully. Hope that's some help.
David