Just google a little and find some hardening techniques.
The best I've seen/done is restrapping the input transformer to output a lower AC voltage to the monitor. It takes it easier on the deflection output transistors.
G08 FAQ- find it.
Two main things I've seen that will zap a G08:
1- copper heat sinks on poorly mounted transistors in the deflection amplifier circuitry. If these touch one another, they will blow the main fuses (hopefully) or overload the rectifier diodes in the on-board supply.
2- internally shorted deflection output transistors. This is very common. This will send too much current through the 'current-limiter' paddle boards. I think those are 2W resistors on those little boards (big). I have seen them SPLIT open and yes, I have seen them catch on fire. A very small flame, but I was right there testing the monitor. I chuckled. I don't believe it could have caught a cabinet on fire before burning out and/or killing something else on the board supplying power to it.
They can run for years if fixed.
Don't be frightened of the 'flaming resistor' stories you hear. A MUCH more common monitor is well known for dead flyback transformers and filling a room with putrid smoke.
Kerry