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After working on it a little more, I'm not sure that's really a drive line. It floats back and forth as you turn the horizontal hold, and basically disappears if you set contrast & brightness so that the upper and lower bars are true black when you're watching a letterboxed movie.
I suspect the line is due to either a sync overshoot or the color burst which is not being blanked on horizontal retrace. You can prove this by adjusting the Horizontal Hold while still in sync, so as the picture moves slightly to the right you will see the bar shift to the left. You may also be able to minimize it by adjusting the fine tuning so that the high video frequencies (picture detail) diminishes and the line will disappear.
Are you receiving the TV signal via cable or a DTV set top box? Do you see it on all channels?
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