Kenwood Model 4010 One Channel Dead

I found a Kenwood KR-4010 when perusing the GW. For $10 I had to pick it up. It is in beautiful shape but lo and behold I got it home and the left channel is dead. Dead through the speakers, and headphones and on all inputs - FM, AM, AUX, etc.

I plan on inspecting it closely for any cold solder joints or bad looking caps.

Any suggestion on where to start looking? Power supply? Pre-amp?

I am not an electrician but can do some soldering, I just don't have the knowledge to properly troubleshoot it. It isn't worth the $$ to take it to a professional so either I figure it out or it goes back to the GW for someone else to poke around in.

Thanks for any suggestions on where to start.

I would start with looking for bad solder and bad caps

You have probably figured out the problem by now, but I would check that the speakers are connected properly. The layout for the left/right is not like normal receivers. Don't ask me how I know.