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+1 for PA, plus double check entries in the setup (eg date, location, daylight saving etc) and time to make sure that these are right - it is easy to inadvertently mess up a setting (eg location) and it is then retained.
It would also be worth checking the mechanical operation - clutches work OK, bearings are free and worm mesh is not too tight.
When it slews to the wrong place, how far off is it?
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