FS Parts: WTB: Centipede Sound POT

So I picked one of these up - I was hoping it would solve my Centipede 'speaker hum' as my old sound pot would crackle a bit when turned. But the the new one just made the hum more consistent. I've seen alot of threads about various speaker hum issues - but does anyone have experience with troubleshooting something like this or have anything they could share? Thanks
 
Unfortunately swapped out the AR board and the problem still exists. This is also after I replaced the sound pot. I wonder if anyone has some quick ideas on what else I could check? Any suggestions appreciated!
 
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