CTC9 troubles

[Jonathan]

Do the brown molded capacitors have to be replaced in my Felton/CTC9? If you look at this you can see the brown molded capacitors. One end of the capacitor has a vertical line, does that indicate a foil side? What about the "Elemenco" guys, should I change them? There are also red molded capacitors too, which look like the brown ones, but usually a bit bigger in size, also having vertical lines at one end of the capacitor.

Must you completely recap these sets like you do the older ones?

And also, the top hat diodes used in the power supply as the rectifiers, will replacing those with a good 1N4007 give me more reliability?

One more thing. the 3.59MHz xtal in the chroma oscillator, can I replace that with a 3.58MHz HC49/U colorburst xtal and get better color or better performance?

Thanks.

Jonathan