They wont replace unless you are under warranty is my understanding
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This was covered 2-3 weeks ago its Fresh.
I was at Cerritos Hummer yesterday and asked the parts guy about this in person, there is no amnesty or grace period at all, If your not under warranty your out of luck.
Each mirror at the dealer is 410.00 each
Good Luck
Also read your manual in the glove box, it tells you how to re-set these, may work?