My issue was fixed with a power switch replacement I believe. I can't believe it's been over 3 years since that happened. Crazy, where does the time go. The unit was long out of warranty at that time, I've now had my MC-12 12.5 years so I guess I've been lucky that was the only major problem. I know there is a problem with the left rear surround, which has been there probably longer than the power issue. The signal distorts and I think probably contributed to blowing a tweeter in my at the time surround left speaker. I went from 7.1 to 5.1 during that time period due to a room reconfiguration and since I don't need my 6 & 7 channels I've never had to worry about it since.
I started looking around for a used MC-12HD about a year or so ago but could never find one in Canada and with the Canadian dollar being so bad against the US buying from the US just didn't make sense as they prices were way out of wack after conversion.
What I think I'll do now in order to get HDMI switching and get away from having to use 7.1 analog inputs for DVD-A, SACD, high res. digital files, etc. is turn my attention to the future rather than the past for my next SSP. A Trinnov Altitude32 or possibly Theta Casablanca E would be worthy successors.