CTC40...No color...suggestions?

[Tony V]

Hi Gang,
The RCA Victor CTC40 combo i bought from Bryan last year has developed a problem of no color. It came on all of a sudden as it has been playing like a champ until two days ago. I turned it on and got only a b/w raster. I checked the color killer adjustment and for anything that looks like it overheated on the color board and no go. It produces no color whats so ever...even with station de-tuned and color control all the way up....not as much as a color bar. It has been playing perfect up until i turned it on the day before and had no problems since i got it from Bryan. It has been used as my daily watcher because it played so well. The video is still nice and strong and clear as a crystal, just no color. Ironically i was getting ready to take pics of it playing so Bryan and the rest of you could see it now. This is the combo that created alot of discussion because it still had the Victor and New Vista badges but was totally solid state except for the rectifier. I'm diagnostically challenged when it comes to solid state sets but wanted to pick your brains as far as to what to check out first. I know several of you have worked on and are very familiar with this particular chassis and would appreciate your input. I do have a schematic for it. Another question...if it turns out that it needs one of the transistors or the crystal on the color board....are these or a suitable replacement still available? This has always been a fear of mine when buying a vintage solid state set. That is why all of my tv collection (except for this RCA and my Sony's) are tube sets.
Thanks,
Tony