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@brain-flick
Do what RPM said, but before taking the BB out try this...
Do you have a crank puller? try taking off the cranks and cleaning the taper of the BB and the inside of the square taper of the cranks, then do them back up nice and tight.
Sometimes it's just a bit of grease/grit which causes the noise. I had exactly the same trouble and just did that to mine last night and it sorted it.
Unless there is a lot of play in the BB or it's crunchy/sticky when you turn it then it's probably fine.