GUITAR -> BFM Wah -> Pitch Black Tuner -> Keeley Dark Side V2 (w/ Expression Pedal) -> Catalinbread RAH -> Analogman SD-1 -> DD-3 -> AMP
I've got a Catalinbread Dirty Little Secret inbound so that may or may not replace the Analogman SD-1.
I think we've established the pot is fried. It sucks. It happens. Just get a new pot and be done with it. But with that said, if the shop tried to fix this and sent you on your way without a resolution, I wouldn't bother going back to them.