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anything that works well is always worth investigating for a repair
it could be a simple fuse for that side amplifier, loose , broken speaker wire
have it checked out and then decide if it is worth repairing
Yes, sounds like your DSP chip has an issue. Not an inexpensive repair if that's the culpret. Around 400-500 to replace the chip. It's an awesome receiver and worth 300-400 in repair, however, a 3800 or 1800 can be had for 600-800 depending where you look. If you need more help, post a comment and I can help you some more.
You might have to take a look into the unit, there could be some damage or a bad solder connection on the front left speaker connector at the circuit board, possibly also on any other component (power amp chip / transistors, internal connectors, etc.), also loose or broken wires or oxydized connector contacts inside the unit.
It could be something else as well, but i guess it's worth checking the above mentioned.
If one channel is out, the output transistors are probably open rather than shorted. It is possible that there are other problems. If you have no experience with electronics, I would not suggest you start here. This is a simple repair for a shop and should cost about $20-$30 in parts (or less if not the outputs) plus the local labor charge.