[old_tv_nut]

Is this a tube set with some transistors and/or ICs? I see B+ on the chroma module = 22.6 V and B+ on the subcarrier regen module = 12.36 V. I als see125 V being looped through both modules.

So, you are following the procedure of shorting J and JJ, at which time you get 17.6 V on the Burst line. Then you remove the short and adjust the ACC pot (where is that? is it on the Subcarrier Regen Module?) to again get 17.6 V on the Burst line. Correct?

1) this adjustment is definitely to control the level of color based on the strength of the color signal. It has nothing to do with colors turning the wrong hue or being unlocked (that would be APC).
I'd think that if you turn the ACC pot with the switch in NORMAL position, you should see the color level change as the DC voltage on the BURST line changes. Is that correct?

2)Without seeing the schematics of the two modules, I would have no guess as to whether 17.6 volts could be out of tolerance.

Once you have made the adjustment, is there anything wrong with the set's operation?

Chasing after schematic listed voltages without a malfunction to suggest doing it could be a waste of time if the 17.6 is actually within tolerance (like, it's actually compensating for differences in circuit components, especially tubes, and therefore should differ from the marked voltage on the schematic.)

Finally, I have no idea why a line marked simply Burst has a variable DC voltage on it. If it's normal for it to vary widely from set to set, it should be marked as such.