I found what I was looking for and learned some on the way. When googling what I assume is the part number in the main output transformer (UP-15v300-pfc) it came up with the schematics. This model number comes back as a Peter Chou UNI SAN UP-15v300-PFC. This also populated as a "suzo happ" part number as well. I have not 100% confirmed these schematics match but everything I looked at seems the same. These power supplies appear unique as the AC filter board is remote mounted to the top case, and has a small daughter PCB soldered 90 degrees to the main PCB. I have concluded and learned the following-
1. AP-300WX and UP-15v300-PFC are the same Model power supply.
2. WMS manual has a different pinout of this power supply.
3. 15V output from this PSU has it's own 15v Ground wire. It doesn't share Ground with 3.3v, 5v or 12v
4. The 2 wire output connector is 5volt "Standby" with ground. This is separate then regular 5v output
5. Grey or tan looking single wire in output connector is labeled P.G. This stands for "Power Good". I think this outputs 5v but not sure
6. This PSU is very different than common ATX Computer PC power supplies. Main Output is only 22 pins(see pic)
7. WMS Manual output miss marked pins. Should be pins 12 &13 +15v Ground. Pin 14 not used.
I hope this helps someone in the future.
Kyle