I'm not sure anyone here has any expertise with CRT repair. You may have better luck (as much as I hate to say it) at AVS Forum with this question in their CRT front projection area.
It's been years since CRT projectors have been around and I know I got rid of mine over a decade ago in favor of digital projection. Very happy to never look back personally. So, it may be a pricey endeavor to get any actual parts related repairs taken care of.
Good luck!