Yamaha A-S301 Help!

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Hello. I just joined you. I encountered a problem with the Yamaha A-S301 amplifier I use at home. While listening to music, I noticed distortion in the sound on the LEFT output after 1 hour. The RIGHT output gives sound without any problems. I tried speakers and cables, but the result did not change. The LEFT output continued to give distorted sound. I tried the troubleshooting combination keys recommended by Yamaha, after that the LEFT side was disabled and sound is only coming from the RIGHT output. I am uploading a video to you and I found a video on the internet that shows the solution to the same problem and I am adding it as well. Could it be Q124c - Q123C transistor failure?

I'm adding a video of the problem I'm experiencing.

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I am having the same problem as in this video on YouTube.

West JoJo Tech Electronics​

LEFT CHANNEL DISTORTED SOUND DB AUDIO AMPLIFIER​