Ha, mine has returned to blue again for a couple of days now, but I also am not banking on it staying that way.

I suspect the connectors to the video/TV module in the trunk, but I haven't got around to fiddling with anything yet. Need to do it step by step to find out which connector is playing up and then posting that info here so others can shorten the fault finding process - unless anyone can suggest which connector caused THEIR problem and so provide the short cut for OUR problem?