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Hey, it sounds like a pretty easy repair, I have had a similar problem on one of my diy clouds, (one input didn't work) it was a bad op Amp, but the pot could be a cold solder joint or a bad pot. The pot that is used for this build is plastic shafted and not the same height as the rest, it's easy to work around but this sort of thing is reasonable to expect. I'd be happy to trouble shoot your module if you want some help. Im in Portland OR, so not sure if shipping would be a hassle, and I'm pretty busy lately so it may take a few weeks before I get a good time to work on it, but it won't cost you more than parts and shipping if I can get it working. Obviously I can't guarantee results, but it doesn't sound like a very difficult problem, and I'm pretty familiar with that portion of the schematic at this point.
Pm me if you are interested.