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Honestly this sounds like a known issue with some of these Motos where the video detector diode fails...When that happens you get no video and weak sound.
If you have a line isolation transformer to power the set with, you could try injecting video at the output of the detector. If you have a pattern generator that can output on the old IF frequencies (like a B&K 1077 Analyst) you can try injecting IF at the ant terminals or 1st IF and see if it gets through.
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