I have a few knobs not working on my sub phatty (headset, octaves, cutoff, etc). I believe these 3 are controlled by 3 different pots (potentiometer, encoder, etc). Would you have a link to website where i can buy them? I am not sure in terms of size etc.
The rotary switches as used for the two oscillator octaves and the LFO waveshape are known to fail.
I bought the replacements for these switches from the Moog support in my country (actually the old company, not the one in charge at the moment). The soldering was done by some solder experienced friend.
And take care, some knobs are affixed to the pot axis with a tiny adapter due to different diameters. Don’t loose these!