So, that possible solution wasn't any sort of solution.
Which leads me to the bit I'd been putting off, getting out the multimeter and painstakingly testing all the resistors.
A long time and a lot of mumbling, headscratching, and messaging Mr. Foxen on Facebook I have identified two resistors that I get no reading from, and one that is about twice the value that shows on the schematic.
This puts the potential cost of fixing the problem into the dizzying heights of about £1.50.
I really hope this is the fix I need, otherwise it's time to get experts involved.
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