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I would look at all the tube sockets on the board especially where they solder to the traces, and the traces themselves. Heat from the tubes would cause the boards to get burnt and brittle. Also check where the circuit board is soldered to the chassis. These were sometimes used as ground points and a cold solder joint could cause all sorts of problems. You might try probing the board with an insulated tool to locate a bad joint.
Just a thought, hope it helps.
Bill R.
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