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I've gone over the entire board and found two .01's in the audio circuit that tested poor and C514 (1uf 350v) also didn't test great but otherwise could find no other issues. I was going to replace those and the main secondary filter caps as preventative maintenance when I placed he DigiKey order but it turns out I can't easily source the diode. An exact replacement is not available, the NTE 570 equivalent is available, but DigiKey will not ship it to Canada.
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