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Thanks B&B.
Moisture seems to be likely. I dismantled the handpiece and left it out in the sun to dry. It is now showing about 20 ohm with the Menu key pressed and open circuit with it not pressed.
I have reassembled it and will leave it running for a few hours in the garage to see what happens.
Now I think I've managed to destroy my NX-01 GPS by feeding it reverse voltage so I'm not having a good weekend.
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