I will give you something to try and beyond that, you have to replace the fader.
Try spraying a LITTLE CRC 226 into the fader slot. Procure this at a Home Depot store in a small blue spray can in the electrical department. (about $2.60) DO NOT USE CONTACT CLEANER such as De-Oxit.
Spray a bit in and see if it improves the situation.
IF NOT what has happened is the sliding fingers have worn through and folded back and dug into the resistance element in the fader. That is fatal!
The faders, once you find the right type are not very expensive say less than $5 BUT there are usually massive number of screws to take out and knobs to remove to get the board out. SOMETIMES the ones you get have to have the "handle" shortened by a quarter inch. Do this with tin snips and clean off burrs with a file.
You need to match the resistance, the hole pattern, AND the "taper" which for those will be an "audio taper" The fader will have a part number on the side and MOST are made by "ALPS". Digikey and Mouser are my usual sources online.
Un-soldering the old fader takes care and solder removal tools. DO NOT force the leads out till the solder is all out and the lead is free. You will lift the circuit traces off the board.
Clean the residue of soldering flux when done and re-assemble.
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