Soundtream D-200 II

I replaced the power supply fets. When I power it up only 1 channel is working. The other channel has the right frequency but it's a square wave not a sine wave.
 

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This board has no component location identification markings. Wow, I just realized that. I feel like that is going to make this repair quite challenging. What do u think the odds are its gets repaired by just blindly replacing every transistor and chip in the amp? I know u aren't a fan of that but in this situation there aren't very many components. The least amount I've ever seen in an amplifier......by a long shot.
 
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Gosh, I'd really start by removing the excess solder around the transistors in th4e upper left hand corner of your pic. BTW, could you provide another pic of those? Would like to help!

What do u think the odds are it gets repaired by just blindly replacing every transistor and chip in the amp?
Possible, probably overkill. Are the original parts still available, though?