did you try testing and/or replacing "1" and "2"? Go ahead and replace those and see what happens. Should you still have trouble, youve got some other problem. I'll check out my schematic!
LOL!!! Today my 20Y1C48 lost the focus! Ironically Ive had more trouble with my zeniths than the rcas!!!!!!!! Darn focus diode! The rcas colors are holding up really well for me. Cant say that for zenith. Im having too many hv and focus troubles and Im getting irritated!

Another quick test is to measure the capacitance, if your digital meter will do so. Very low capacitance compared to what it's supposed to be indicates a bad cap. I found an electrolytic cap in a Kodak projector that was supposed to be 1500 mfd. and it only measured 30! (it was the source of the problem). A good cap will often be slightly above the marked value.