Could be something as simple as bad solder joints on the video input connector. Or you could have a bad transistor on the neckboard for the red signal. Or maybe one of the red cutoff or red drive pots on the neckboard is bad.
Maybe even the picture tube needs rejuvenation (especially if it has one of those 22.5 mm diameter necks).
If I had to guess, I'd think it was something with the picture tube. I played around with the red cutoff and red drive, and they do have an effect on how much red there is, it just seems that the red is really faded, but not completely absent, if that makes any sense.
I don't know, I guess my question is do you think this is something just any TV repair guy can come out and fix? I'm not sure I want to undertake the task myself. I've done everything else on the machine myself, but I know if I got started on the monitor it would just sit there, torn apart, for about 6 weeks before I decided to finish it. I'm a lazy bastard like that...
Thanks for any input you guys can offer, I appreciate it.