Paperboy Medium Res Monitor Weird Line

[eb94110]

I have had this line on the left of the screen on my Paperboy forever, even after someone recently replaced the flyback with a 4900 flyback because the original cracked. It seems brighter than the rest of the screen. Any ideas on what it might be and how it might be fixed?

Thanks so much.

 

[tron guy]

It strikes me as a horizontal hold/position type of adjustment.