All I can say is, I have the same problem. Been looking at some higher powered / better quality 6 channel amps, but a bit confused about the wiring. Probably end up a winter project.
From what I've read they upgraded the amp to a fan cooled unit in 2008.
BTW, been umming and ahhing about your steering wheel. Seeing as this is my first post, could you PM me if still available (hold on, that could have been my 2nd post).