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If you have a spare damper tube, swap it and look for changes. Rock the tube in the socket, maybe you've got a dirty contact there. I don't have your schematic, but typically you'll have a pair of .05uF capacitors straddling the horizontal linearity control. The 3 components are are collectively called the "boost network". The coil could be bad (unlikely) or the caps could be bad (more likely). If you've already replaced the caps, and you feel confident that they were good to begin with, doublecheck your solder joints and make sure the leads are short and proper.
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