I appreciate the concern but we are pretty well versed as to the design parameters of the machine and done plenty of PCB level repairs before. We know the power supply is bad, we know what it powers up, and we know why it went bad but the only thing that concerns me is there is a signal voltage that is returned as a closed loop back to the CPU board for a systems check. If there is not voltage returned to that board, she won't go. That CPU board is VERY pricey so we do not want to be sending voltage spikes to it. There is also an unknown about of time one the system is energized for the CPU board to do a system check and clear any errors. Ie, there is a window of time for all systems to boot up before erroring out.
We are still trying to repair the PS. The frustrating part is not the actual repair, it is determining the what the components are so they can be tested properly. Obviously there are several components that fit in a TO-92 package for instance. We obviously could not accurately test or replace components until we know what they are or it is just a best guess.
I am really looking for a semi conductor failure but that is just a guess because nothing made smoke, nothing got hot, no current over loads tripped, it just lost 2 of the 4 outputs. I am really hoping we can find a fix for the OE PS and be done...