Magnavox CD4756 (T989 chassis) dark bands down left edge

[Alex KL-1]

I see the image issue again in the post#1...
One color TV of mine have this bars, but are more apparent if I adjust the H.size coil for less width/less overscan. For factory adjust, only is possible to see the last one bar.
I also saw it with a B&W tube Telefunken set, perhaps related to linearity control.
My Admiral '60 tube TV (recently working!) also have some of these bars.
Some systems have it "inherent"/more evident due to manner that linearity, width, flyback, yoke (and convergence) interacts. Supposedly, the bars are to be outside to visible area...

Of course, your TV have the H. size issue, so this is a misterious for now (I also don't have a clue about the real culprit here).