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Ah, that is the resistor I was talking about in the original post, it is connected across the filter capacitor.
In the pic it sits in this awkward position because I've temporarily added a 3k resistor in line with it as it's resistance changd from 19K to 16K.
(I will replace it with an appropriate resistor later on, I am not going to leave this "fix" in place as I know that the bad resistor might drift farther with time).
The resistor that is in line with the reg is mounted separately from the board (on the back of the aluminum plate), it's 130 Ohm and measures 133.3 (with the regulator in place).
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