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is there another dealer around you-there relying on you giving up so they dont have to repair it (time consuming and they dont get same payment for warranty work from ford)

you paid for the warranty as well when you purchased - start talking fair trading if thier not interested in repairing which can be anything from cable undone to the headunit etc. they are able to check signal strengths/fault codes etc. with ford scantool,have also seen headunits fail before ..