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Funny, I don't recall seeing any PC boards in that RCA, though it is so full of leaves I could imagine not seeing it under all that.
The audio board is in the right front, viewing the set from the rear. It's rather small containing the 6AU6, audio IF
and the 6AL5 ratio detector.
I have a KCS87, which was simular, but a cheaper 17" model. IIRC, the IF in that model is hand wired.