As the third owner of my set, I hear you.
In looking at the Order Confirmation, I note that AT "replaced both joint cases." Only one was broken, so it strikes me that maybe this was a known issue repair. I was charged nothing, and the Service Performed section indicates "Non-Warranty."
You can send them in for an estimate, which costs 30 bucks. If you go ahead with the repairs, then you don't pay the $30. Anyway, the treated me right, so I'm going to send a nice email.