Originally posted by Sandgroper:
Thanks for the thoughts on the switch problem.
I did the diagnostic check and everything seems fine, I think the trouble is definitely in the switch.
I took the panel off and looked around, looks a bit complex in there and we have a gig tommorrow night, so decided discretion was the better part etc: and settled for a squirt of contact cleaner down the sides of the switch.This has made some definite improvement. I will try something further when I have more time before a job. Do you know any place where parts may still be obtained ? It would be nice to have the new part before dismantling if possible.
Thanks again for the assist.

It sounded like the switch rather than anything else. Try here putting SXKN7000 in the model search box: http://www.pasc.panasonic.com/Epartr/PartslistChoice.asp?