pac-mania - where has the sound gone?

Superully

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ok guys, it started with the sound on my pac-mania being there sometimes and sometimes being gone. when i turned the sound potentiometer on the pcb, the sound "crackled", but it worked afterwards. now i've reached the point where there's no sound anymore, no matter whether i turn that sound poti or not.

not sure whether it's the speakers, the poti or something on the board itself. it would be an easy thing to test if i had another jamma cab, but i don't. hey, wait a minute, is toobin jammatized or not?

ok, let's assume i can't test the pcb in another cab, what would be the first thing to check?
 
i was told by someone that those potentiometers used on pac-mania and galaga '88 (amongst others) often go bad and should be replaced. the question is:
which poti is used and where can i find replacements?
 
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