I've updated the rest of the thread with what I've tried today. You'll see that I have tested the PSUs and tried removing various items but with no success. The PSU test advises not touching tnhem until tomorrow, so the job then is to try your suggestion of removing it and cleaning the various contacts. I'm not sure what an earth plane pad us, but no doubt I will find out tomorrow when I clean them ;-)
Thanks for your suggestion, will update tomorrow. It still seems odd that it just suddenly happened....
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