If you pay for the service they will ship the parts back - if it's a warranty repair they don't always do so.
As you can see here, in this case Omega sent the parts back, and the watch owner sent them to me for review:
https://omegaforums.net/threads/a-look-at-some-defective-parts.62631/#post-784069
But that doesn't always happen. I thought in this case it might be the DLC barrel problem, but without the old barrels to see I can't say for sure.
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