First PS5 Repair - No signs of life

I’ve got my first PS5 repair in yesterday and I am in need of some guidance. When the power button is pressed there is absolutely no signs of life. No LED, no beeps, no fan spin, etc. I tested the power supply and it’s feeding only around 10V into the console. Even with the PSU completely removed from the console it’s only outputting 10.4V, when I believe it should be 12V. Would this suggest that the internal PSU is faulty?

Yes, psu should delivery 12v to Mainboard

Gotcha. It seems this PSU is faulty then so I’ve ordered a new one. Do you have a diagram that I can use as reference to check for any shorts and what not? I couldn’t seem to find any short but I want to make sure.