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I tend to agree, it has to be related somehow, from what I can see, 260v C only goes to 2 points, and is fed via a 2.2k resistor, very easy to pull down, point 1 is the audio output, where you are seeing the odd resistance checks, fed to G1 via R45 (820K) pins 2-5, the other is the horizontal oscillator, via L22 & R62 @ V10 pin1.
Of course, another suspect would be C2c, if perhaps you see a lower resistance to ground on the power supply of R45 than on pins 2-5 side, one way or another, something has to be pulling that 260v C down, and the weirdness at the audio output is a yellow alert, you have to find the red! :P
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