Replacing MicroVAX II PSU With a Modern PSU

While I look into what is wrong with my H7864, I'd like to use a modern PSU to power my machine (actually an rtVAX 1000). I think I would need to deal with the following problems: 1. Finding the right connectors (ideally, I am sure I could rig up something more temporary). 2. A way to power the fans, which I believe are 15V, perhaps they would run on 12V as I wouldn't run the machine for long periods anyway, or I could just use PC fans. 3. Emulate the DC OK and P OK signals, I suspect these would be simple +5V signals which could perhaps just come from the +5V of the PSU anyway (unless there is a problem with that). 4. The most difficult bit, I suspect, would be the PSU LTC signal , which I believe is some kind of clock. I don't know what the spec of the signal is, but I will get a scope on a working one to see (NB don't want to risk a working PSU on this machine in case it was a problem with the machine itself that caused the first PSU to fail, I don't mind sacrificing a modern PSU if need be). Has anyone done this before? Regards Rob