"Apparently Channel 1 died about 4 years ago, and recently
Channel 2 died. "

Shame, if you would have worked on it then you would have a good channel for comparison. Like in a stereo, using one channel as the reference for the other.

Couldn't find a print on it.

What do you mean died ? Did the trace stop moving or did it disappear ? If it disappeared the first thing to look at it the voltage on the deflection plates. If they are equal look to the blanking circuit.

This is not going to be easy without service information.