Thanks again Ian(?) I appreciate your advice, and I shall heed your warning.
Start looking front, or rear - what you reckon?
Here's another thing - the online instruction manual for the JTV69 talks about resetting the guitar by positioning the 5-way selector switch at 3 - holding down the model selector switch while inserting a 1/4" lead until both the selector and the alt tuning switch flash red - then releasing and pressing again, whereupon both switches will flash rapidly 3 times in red, to indicate all the models have been re-set. I have tried this many times, but it just never gets as far as the first red flashing. Is this a feature perhaps only available on models manufactured later than mine, or, is this yet another fault?
Regards,
Tooma.