Thanks for the reply,

Unfortunately, I have neither the ability or the tools... only the ability to research the issue :-)

As I mentioned, from what I could gaher, a replacement would do the trick, so I took a gamble and bought a used Combox, it only cost me £30, so no great loss if it doesn't work, but I just want to make sure that I do it correctly, and also don't suffer any issues after fitting. I have read that it is simply 'plug and play'. but of course, there are always different scenarios out there, so I was hoping that someone had already replaced a Combox and could give me the benefit of his/her hindsight. :-)