I'm pretty sure it's the roof mechanism unlocking from the body rather than the windows. Try dropping the windows 1st then pulling the roof switch to see if the same noise is there.
I've only had my car for a month so I'm no expert.
I have bought some lithium grease for the mechanism and I've got some stuff to feed the seals.
There is a maintenance guide on here somewhere, I will try and find a link for you when im on a pc later.
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