I had my Nak serviced by B&W in around 2016 . There is a company called Nak Labs that does refurb and servicing. I am from the UK but living on mainland Europe.Lovely! I’ve a ZX7 I’d like overhauled but since the B&W shop who serviced UK Nakamichis closed a year or so ago I’m struggling to find somewhere with the know how and parts.
I can’t remember, are you in the UK?