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Phil,
I know it's a long shot (well, so were the suspicions about the v.det diode), but see if you can locate the mixer plate adjustment. It may be a slug or a trimmer. Just tweak it slightly in both directions while watching a normal color program. Can't hurt nothin'.
In fact when we used to get tuners back from the rebuilder, there was a reminder tag stating to optimize the mixer plate coil if necessary.
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