200e

I'm for posing more technical questions, but I understand Buchla and 
Associates does not support 2nd hand modules.

I reported before that I have a pair of 259e modules.  One module is 
misbehaving and one is good.  I notice that the black and brown wires 
that connect to noisy and quiet ground are reversed in position on 
the PCB of the module that is misbehaving. 

Sweeping the main frequency knob on the misbehaving module results in 
alot of jitter. The Principal osc is also affected by sweeping the 
knob on "fm in" to full even when nothing is patched in.

Are these issue affected by noisy and quite ground?  Should I reverse 
the connections on the PCB to make them consistent with the module 
that is not experiencing these issues?  Or, is thes jitter problem 
because the pot is wearing out and I should just replace the pot?  
BTW, does anyone know the make and model of the pot and values of the 
pots on the 259e?  The fine tuning pot is the only pot with markings.

Thanks!

Roger.