The fan stopped working in my HR20-100 resulting in thermal shutdowns. It is going to be replaced through the protection plan. Glad I signed up for that. Anyway, what are the odds I get another HR20 shipped to me? What the odds I get an HR21, 22, 23, or 24? Also, I do have an OTA setup through my SWM8 which was self installed, so D* doesn't really know about that or so it seems. Not sure I want to sweat hooking the antenna back up again, so I didn't request a replacement DVR that supports that. But if I do change my mind down the road, does the AM21 work with only the HR21, 22, 23 models? Thought they had a new version for the HR24.