Problem potentially solved - wiring issue after conversion to fit the Vixen cover - seems the RA was running on one phase only.
Found this out by checking the wires, and noting the current was shunting on and off to the DEC motor when I fiddled - when it shunted, I noted the DEC motor making the same groans and noises.
So, to resolder. I am a shocking solderer, but it has to be done. May have to investigate making more room for the wire loom too.
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