Update.
As my stereo has only a volume issue,we have since decided,after taking the pot apart, its not the pot at fault,but the microchip its attached to,so does anyone know the number or whereabouts a replacement could be sourced,its made by motorola but thats all we have to go on.Its now got my mate curious and he wants to see it through,if poss,but in the meantime I might purchase another unit,as,its nice driving these cars and realising how well they are made,but its nice to have a bit of music.
