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The thin line image appears when the vertical deflection unit is not operational. This is a major fault for which you will have to take the tv to a repair shop - several components (starting with the vertical amplifier) will have to be replaced. In the mean time do not use the tv, or it may fail completely.
If the picture is closing (top to bottom) and goes back to normal when you hit it you probably have a bad solder connection on IC501 (location number) the vertical deflection IC on a metal heat sink. If you mean outwards as in side to side as it looks in the picture, I don't know specifically where to solder but get a magnifying glass and look for suspected bad solder connections. Look for the word width if it is there. It is good that you a confident in soldering.
Usually that symptom is caused by cracked solder joints on the vertical output IC. As the IC starts heating up, the picture starts breaking up at the top with several "dancing" dark lines appearing, the top scrunches down and then when the vertical quits altogether, the screen goes completely black. A good slap on the side of the TV might make it happen faster or clear it up temporarily. If you have experience working on PC boards then you can resolder the pins of the vertical output IC but if you have never soldered parts on PC boards then allow a qualified tech to handle it for you.