I have a 1990 Mitsubishi

I have a 1990 Mitsubishi Eclipse and have replaced the ECU 3 times with used units.

The 3rd and current replacement is now dead and I want to rebuild this unit myself.

I need to find out who has the schematic for this ECU. I'm not talking about pin-outs or what color wire does what.
I want a real schematic that shows components mapped out on the ECU motherboard.
I want to know specs and part numbers for the ic's and transistors. I can figure out the capacitors, diodes and resistors. The fuel injector circuit is dead and I need to find out what drives them.

If anyone can help I'd really appreciate it.

Thanks