Hello I new to the Forum. I have a 2014 Sealy Mighty Mig 190 which has developed a problem with the wire feed fine adjustment. Changing the power settings steps the speed of the wire but I cannot fine tune the rate of feed with the adjusting knob (Potometer) The Potometer gives different Ohm readings as its dial is rotated so I figure it is working. PCB has no burnt out resistors that I can see but I do not know where to look. Has anyone come across this?