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I think it is next to the bedroom light switch. You should be able to unscrew the light switch and pull it out without making any holes. Be sure to report back where it is.
I just went out and double checked mine (we do have different units though) and the brown t-stat wire was in the wall next to the bedroom light switch. I had to fish around for it with a stiff wire shaped like a J to find it though. I am sure the factory will chime in soon enough though.
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