Smearing is almost always CRT. If it only the red & only
with the color turned up even more so BUT it should
also smear some on a hard driven B&W pix.
Only other thing is the 200V that feeds the 3 color output
transistors. If the 200V isnt clean you can get smearing
& a lot of other symptoms, often subtle. Check
any 'lytics on it.
For blue pot you can add a 2W resistor in series with it.
About half the value of the pot. This will move the setting
away from the bad spot. Then you can scare up a replacement.
73 Zeno
LFOD