[old_tv_nut]

I'm not sure I follow what's going on with the color, so forgive me for thinking out loud. If this set uses an IC for the color section, and it's basically working but varying, it could be the IC, but it could also be the control voltages, including intermittent connections, or problems with bad filter caps if the controls supply DC voltages rather than video signals. Also, does this set have some sort of automatic color switch that could be intermittent?