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With all three screen controls down you should not have the green line. If there is a crt bias control you may need to turn it down until the green line goes away, then adjust all the screen controls. There may also be a resistor out of tolerance in the circuits biasing the green gun. Another curious thing is the drive controls. If I remember correctly most sets only had two drive controls. You start with them at max and reduce whichever is needed to eliminate color shading in the dark areas of the picture. End result should be a B&W picture with no color shading in the light or dark portions of the picture throuought the brightness range. If with the crt bias turned down you cant get a line with the screen control, leave that control up and turn the bias up until you get the line.
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