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It is a CEE 16A five pin. No changes on the wall, socket or cable. The MAHO has been working without wiring change from this socket for about 6 years.

Yes, neutral is wired in, but unused by the machine. Since the original Phillips PC used 110VAC generated by the 6T1, I wired the LinuxCNC PC and monitor into the same service.

Okay, this got weirder. I just went down to the machine,  manually switched off 1Q1 (I misunderstood that as Q1), plugged in and switched the machine on (with Q1, the main power switch), and PC powered up normally. Switched Q1off, reset 1Q1 to on, switched the machine on again, and it again powered up the PC normally. measured 114VAC between pins 150/151.  I could see from the Mesa LED's that the 24VDC rail 204 was also powered. I changed nothing other than waiting a couple of hours and plugging / unplugging the socket a couple of times.

Writing this, I just realised I need to open up that CEE plug on the machine cable, and see if I have a loose connection in there.

That wire is on a 5V regulator pin, so maybe related, hard to tell.

Yes, NCV7608s are obsolete, we do have spares if you need a few.

Thanks, Tommy.
The shop is heated and very dry, especially during the German winter, so moisture is probably not the issue.
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Max