need circuit board

I have a Polk surround bar 3000. I have lost all sound. I took it to a local TV repair shop. They are well known, and are very reputable. They stated that my circuit board is shot, and they can not get a replacement board. I use to repair TV's for years on the side so I am comfortable with working on and with electronic circuitry. My problem is getting the board. If it is truly unavailable I guess that's end of my search. However if it is available were go I get it and how much will it set me back. Let me thank anyone in advance for your help. It will be appreciated.

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