Distortion in channel 8600

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A few weeks ago I had an issue where my right channel was sounding weak so I pulled out the board and reflowed the solder in the amp tube socket and the problem seemed gone. This week i started getting some distortion and now again some weakness in the same channel. I’ve switched tubes and wires and it’s always the same side so it’s gotta be something with the board. Hoping for pointers here.
 
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