It was my first Onkyo purchase, and perhaps my last. I realized today that my left front channel is simply not working. I connected the left front speaker to the center channel with the same wire to confirm the wire was okay, and the speaker was okay. It's producing absolutely no sound. out of the left front center. Just over 4 years old, it should last longer than that. How much does something like this cost to fix? Should I just replace? Is it possible it's something simple? I have taken very good care of this receiver, keeping the cabinet open, and I affixed a home theater cooling fan to the top that pulls the hot air out of it at all times when it's operating.