I can't comment in specifics, but in general, repairing circuitry around CRT's is a specialized line of work, preferably complete technical documentation should be available for the device and there should be access to spare parts. It's also a dying art since CRT's have of course gone out of fashion for the most part. Moreover, defects around the CRT are just one caterhiy out of several failure points.
Realistically, I think in most cases if a machine like this dies, it's best assumed to be a lost cause.
If this is for protection of native digital or 'hybrid' images, I'd forego the whole film recording stage and look at digital projection instead.