For some critical alarm issues you can use the clear facility-alarm critical command. However, this doesn't resolve all issues. Unfortunately, if the above command doesn't work, there isn't another option other than to start replacing hardware. I've got a crit alarm on a perfectly function 1006 right now, and we basically just have to live with it. It's a bug, in my opinion.
Actually, seeing this question made me take another look at the 1006. Use the command show facility-alarm status critical and the device should give you some more information. In my case, the alarm wasn't what I thought it was, it was just an unshut interface with nothing connected. I shutdown the port, the alarm cleared without having to do anything else.
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