Trying to bring color back to a CTC 120C console TV

[MRX37]

I mentioned this TV before, but it's been sitting for most of the winter. Now I'm trying to fix it, because a newer RCA I had hopes for turned out to be unsalvagable for me, and I could use a TV.

The TV turns on and gets channels just fine. However there is no color in the picture. No color on the video inputs either. Judging just from the black and white picture, the CRT is nice and strong. Also, it displays channel numbers on the screen, and those numbers are green.

Here's a picture of the schematic. I *think* the issue is in the area i circled in red.


I've messed with the chroma input level and the colorsync screw a bit, but no luck.