Remove the black rubber cover from inside the instrument housing. The instrument cluster is held in place by two Torkx screws. Remove these and disconnnect cables behind. There are an number of bulbs at the back of the cluster.To remove ,twist the bulb holder carefully and pull at the same time.
Buy repalcements from a motor factor as they are very expensive at Halfords
bill, February 2008
I have the same proble behind the tens digital speedo display. I spoke to a man at citroen and he said it could be the bulb.
I want to know how to change/test it too?