[Yamamaya42]

Since you have given test point A a bias sweep of 0-9v with no results, and been over the resistors in the IF section more than once from what I can see, this basically only leaves one thing left, the IF is badly out of alignment, this is likely causing AGC to overcompensate, as there is no video for it to reference to, causing the abnormal voltages.

Who knows, the de-tuned state may also disrupt the normal voltages, be that as it may, color sets are quite hard to align even for the most experienced techs with the right equipment on hand.

It took me 3 tries to align my BW Arvin set (45mhz), and that was just with a frequency generator and a volt meter.
But for color, you need a sweep marker generator and a oscilloscope plus lots of know-how.

But the one thing that must never be done is, try to visually align a color set's IF, this will always end badly and make is worse than when sttarted.