what kind of 33" WG is this? I didn't catch that.
since you were able to ground and get color more than likely you're probably looking at some lifted traces or separated solder pads somewhere on your color drive transistors.
I documented some fixes I did on a K7000 that could cause what you're experiencing.
you'll see the lifting in this picture:
if you scrape the outer green part of the trace, you'll see the brass-looking surface underneath that you can apply solder to. I reconnected the transistor leg to the trace this way. the right circle shows the lifted solder pad there, that transistor flopped back and forth like crazy cause it had no support holding it in place.
the right circle, I did the same trace scrape method, but to give the transistor more stability (since there was lifting) I desoldered that leg entirely, bent the transistor leg flat at a 90 degree angle to the surface, and then reapplied solder to give it a good connection.
this one's from a WG U5000 that had shitty red. I had the monitor rejuvenated (I know it needed it, I saw the levels on it) but after the rejuve, I still had a very faint red. upon closer inspection I saw some hairline breaks in the traces at the solder pads. for this one, since I never did it before, I decided to all out replace the traces with tinned wire.

it's very ugly, but it worked, and that's all that really matters to me.
hope these methods can inspire you to do the same with yours. heh