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Hmmm........
Does the red move from side to side at all when you adjust the center convergence? if it moves, but not far enough it could be the centering rings on the red yoke got moved so far that the electronics can't make up for it. A couple years ago I had a set like that, and I could center the color that was off (don't remember if it was red or blue), but doing so caused the IC to run quite warm. (well, scorching hot actually). I put an ammeter in series with the fuse to that IC and set the electrical centering adjustment for that color to draw minimum current then moved the rings to pull the test pattern back in line. I don't know if that ring was out of whack from the factory, if the customer was messing around with things, or if I bumped it while I was working. At any rate, it got it working and the IC ran a lot cooler. The edges were pretty close, and only needed a touch-up to pull them back in line.
I'm just thinking out loud here. Hope it helps
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