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Always check tubes first. Best to replace caps in that section to start. Dirty tube sockets or a bad/dirty vertical hold or linearity pot. make sure the filaments are lighting up in all the tubes if possible. Check solder joints on the PC board if it has one. I had a problem like that in my ctc-9 and it tuns out I had a broken wire at the vert control pot. Sometimes it's simple, My CTC-16 had a weak 6GF7 on one side of the tube. It had a decent picture but could not adjust it to full height. After replacement with a NOS tube, it works great. Try these first and let us know.
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