See this: and also in my book Tektronix volume 2 you can find several notes on 2465 and similar PSU repair (free on www.k100.biz).
But I agree with Harvey: you should try to investigate what exactly fails and if the inverter runs or what. Remember that the inverter part is with live ground, you need an insulation transformer. And never forget the extra fans if you switch it on outside the box. Another ideas is trying to operate it at lower voltage with a Variac. Remember that the TL594 can be tested also without switching on the main supply, with an external power supply.
Does the unit restart automatically when shut off?
