Thanks everyone. As I said, I got a code online. It turned out to be the same as the one I had in my users manual, but when I entered it, it still said incorrect.
Maybe it's been replaced at some point?
Potentially, but it does look like the stock CD6000 that comes in old Fords. I'm thinking that the unit is going to have to be replaced.
@TRA started
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Thanks everyone.
As I said, I got a code online. It turned out to be the same as the one I had in my users manual, but when I entered it, it still said incorrect.