[paulsherwin]

As I said earlier, it's easier to add a line level input which just needs a switched stereo socket somewhere unobtrusive. You can plug anything into that, including a Bluetooth module. If you want to fit a BT module internally there are a number of power supply and switching issues to address. You could pay someone to do this for you, but it may not be cheap (think of half a day of a skilled plumber's time - the level of skill is similar).