CTC-10 adjustment lug?

[frenchy]

I am finally back to this remote-contolled CTC-10W giant that has been pining away in my garage till I had room in the house to bring it in and work on it. The basic problem I have right now is no color - black and white is fine, and locks on the color signal, but once locks in all I get is varying intensities of purple in the picture instead of all colors. Tint control doesn't change it at all.
But first I have a question about this adjustment lug that's on the top side of the chassis in the color demod section, a grounded wire that can be plugged into two different positions. I can't seem to locate this thing on the schematics and want to make sure this is original, or not, and what it does, before I rule it out as possibly having an effect on the color section. Attached is a picture, lug is right in center of pic. Center lug = ground, two on either side are the adjustment plugs, two more on ends of lug go to wires and have a resistor bridged across them. thanks!