Threshold s200 recap help

Hello, I recently picked up a threshold s200 optical bias that has issues. One side has a low output and a very high dc offset of slightly over 2 volts. I'm wondering if anyone has a parts list for this amplifier or has recapped the amp and can be of some help. Any trouble shooting would be appreciated too.

I have experience building some amps such as an aleph j clone, a tubelab SSE, a bottlehead crack, a nutube pre amp but have not attempted to recap or really fix any issue that's this serious.

Would it be better to bring it to a tech? Or is it a fairly easy design that I might be able to cut my teeth on? I'm worried that without a parts list it might be exceedingly difficult for to fix this or recap it. Any help would be greatly appreciated.
 
I did manage to find a schematic so that's some help at least.
 

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