PCB board doenst specify negative side for cap ADCOM GDP500II

ADCOM GTP500II. Capacitor C308
Googling the above phrase, you can get a service manual. In it, it lists C308 as some bizarre number, while all the other caps are normally described, like "10uf 35V". I took a quick look, but couldnt find C308 in the...extensive circuitry. That's your job; find it and show us the part of the schematic therein. Then you'll get a good answer/
 
The schematic is here. https://manualmachine.com/adcom/gtp500ii/3246909-service-manual/

I just did find it and like someone posted, it was impossible to read! I have 63 year old eyes. Ill check this newer one I just found (above). I attached a clip of the description. I think it is a non-polarized one as someone mentioned but I rarely do this and thought you experts might help an old guy out.
 

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