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+1 DIY or Bintel.
It's not hard.
Aside from cleaning the optics which is frankly trivial, the less obvious thing is to mark the perimeter of the corrector, retaining ring and the OTA with a pencil (or marker pen, anything) so you can put the parts back together in the same orientation. This matters, a lot. Do this much and the collimation will probably be still OK afterwards.
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