Rec Gain stopped to work

exactly as in the object, my rec gain knob is not working anymore, everything is ok, but i can't add gain, if i move nothing happens
both on jj os2xl and akai os
both on left, right, stereo, l+r
apart that is ok, is like is stucked at the minimum value...

anyone?

Treat it with DeoxIT D5 and F5 afterwards.

If that doesn´t help you need to solder in a new knob...

it was the cable on the board below... solved