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If it sounds horrible when running (even without coffee beans) like this: https://www.youtube.com/watch?v=PcQcbHIP... then it's probably either a damaged torque limiter or a stripped drive gear. FYI: The situation in the video was the aftermath of a rock getting jammed in the burrs.
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I don't cover tear down all the way to the gear box. Step #9 is as close as I go. In the photo though there are 4 washer screws and 2 screws on the encoder. If you remove those you'll be well on your way to investigating the gear box.
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The options to fix either of these are not as well explored, so if there is damage here and you fix it successfully, post a comment below. FYI: Breville has a repair service for about $90 and that may still be the best option in this situation.
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The torque limiter may be "fixable" by stretching each of the radially-distributed springs about 2mm each. This should increase the torque at which it slips.
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The drive gear on the right has a potential source found by a user below (Thanks Dave Gordon!): http://www.forumappliances.com/breville-... This is not yet verified to work, but the price is reasonable, so if you try it out and it works, post below so we can know!
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