My HRW doesn't work either. Like you I've checked the fuses and they're fine but still no voltage at the window connections, and also like you the heated mirrors don't work either. I suspect that the electronic control unit is at fault as I had continuity across the terminals on the window itself and the the relay is ok. Problem is, I can't find the ECU. The manual suggests it's somewhere under the dash near the steering wheel, but doesn't say exactly where.
If you do get it fixed could you post the cause of the problem on here as like you say it seems to be a common problem.
By the way, a word of warning; If you are removing the connectors from the copper terminals on the window be very, very careful I wasn't and ended up pulling the copper connector off the window. If I can't think of a way to fix it back on it'll have to be a new window.