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The bearing that goes into the K1 drum assembly (#228 in your picture) is A013-981-94-10. I've never removed that bearing nor ever seen a reason to remove it. I have no idea why its missing unless the reverse piston clearance was set up incorrectly and it just burned up and came apart. But considering the scoring on the reverse piston shaft, I'm thinking they removed it for whatever reason and forgot (or couldn't figure out how to re-install it) to put it back in.
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