I recently am having trouble with the center channel of my 5.1 receiver. It seems to be a little weak. When I run the test generator at settings where all channels were the same volume in the past with the same speakers, the center is now noticeably weaker and makes it difficult to discern dialog in movies. I also notice that the fan doesn't seem to be kicking on at all. What is going on? Is this a fixable problem? If someone knows 5.1 out there and can head me in the right direction it would be greatly appreciated. All of the other channels function properly and sound great. I notice the center is also weak on EARS and Pro-Logic as well. I like the sound of this amp and don't want to retire it just yet. Thanks, Kyle