Well this is turning out to be difficult to find the cap.
Zeno, when you said follow where R1, 2 & 3 join - I am assuming you were referring to R10, 11 & 12 that go to Q1, 2 & 3. So if my assumption is correct (and if it's not, then I'm way off and please correct me), the resistors are fed by wire 13B, which on the main PCB goes to 13A. 13A connects to multiple traces on the PCB that lead to various resistors, one of which leads to the video transistor that I had to replace. Trying to make a mental schematic of all that is beyond me, but I can't see where any of it is connected to the cap I'm looking for.
And the only solid state schematic I have is for that porta color (JA chassis), but on that one, the RGB transistors look to be fed off the power supply instead of the flyback, so that is no help for me with this set. That is my dilemma. Not the end of the world though, I just wanted to change the cap and see if the bars went away.
If anyone can see that I'm missing something obvious and you want to smack me, feel free to point it out.