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Thanks Rowland,
It's definitely a camera issue of some sort. The cables were all hanging loosely - I have had cables tighten during slewing (usually the dew heater cables) - but I always lookout for that.
The elongation quite clearly appears when the cooler is plugged in and disappears when it is unplugged. It takes 1-2 seconds to fully elongate -I suspect it is caused by fan vibration. Central DS replaced the fan but maybe it has happened again with the new fan. It should be easy to replace again with a different fan. I don't know why it would happen so soon a second time.
I will see what details I can give you.
Regards,
Tony.
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