[Yamamaya42]

As you may recall, it took me months to get mine working, mostly trying to get color working, and sorting out the mess that the person/persons who worked on it before I got it.
Almost EVERY resistor on the color/video pcb had been replaced with carbon film, almost all being correct values, I think that only 3-4 were wrong, 10% of the caps were replaced, color takeoff coil and bandpass also replaced before I got it, and the most disturbing sign was that the cover for the IF section was gone.
For almost ½ year, nothing I could do could get color via the tuner, but I got barberpoleing if video was fed into 1st amp, but no color lock, this was found to be because of a partially open color osc coil, fixed and BOOM color, took a while to sort that out, but still no color from tuner.
Then had the idea to go back 1 stage, unhook the video detector diode and feed video in there, NO COLOR, ding! The 4.5mhz trap was way of, some putz had tweaked it, I adjusted it while feeding in video at that point, and was able to get color via the tuner after that.

My set works pretty well now, but there are a few minor stuff.
It's obvious the IF has been messed with and can use alignment, which I don't have the setup to do, it works but not as good as it should, so I have direct input option.

Vertical blanking does not work well as it should, retrace is seen sometimes, most likely related to C31, still original part.

Shadowing in relation to light and dark objects on screen, IE, bright stationary credits on darker background, symptom seen often in these sets, also most likely due to old caps in video output.

As I deem these minor, and can do nothing about the IF, I leave it as is.

But like someone alluded to, restoring a vintage color set is like fighting a trench war with one arm and leg tied behind your back.

Slow , steady , methodical!
As suggested above, disable what is not needed and see what happens.