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Thanks everyone for your responses, here and private message.
Testing resistance across the guider port pins when the mount is turned off I don't see any reaction, no indication of a connection.
Now understanding the way the guider port works I've made up a small cable which connects the common to each of the NSEW pins. With this connected to the guider port of the paramount behavior of the mount appears correct and normal. I'm not sure though whether using this method to rectify the problem risks further damage to the mount.
I haven't been game enough to test for a voltage with the mount on, me and my fat fingers, don't want to short something else out.
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