I have two of the small knobs on my V-Synth (original) not functioning right.

One knob (LFO 1 volume) doesn't seem to do anything, but when the knob to the left of it moves, it moves in synchronicity with it.

The 2nd knob I'm having a problem with is lfo 3 of the 2nd osc. It isn't keeping up with the rotation when it shows it on the screen - it lags a little/doesn't quite match up and doesn't lock in the center like the other lfo knobs do...I was thinking maybe contact cleaner would work for this one?

Any help would be much appreciated.