As Paul said, might it not be under warranty if it is so new?
Edit: I see, you are a new user of the unit, the mixer isn't new. Got it. Sorry.
Regardless, I know you said "X32 Rack", however I was able to find this:
[URL unfurl="true"]https://www.manualslib.com/manual/1299090/Behringer-X32.html[/URL]
Which is the service manual for the X32 console version, and there might be some similarities in terms of some circuits and / or the power supply. It's a start anyway.
And yes, it's very unusual to find direct manufacturer downloads of schematics these days. Presumably to prevent making it too easy for competitors to copy proprietary ideas. Nice that a few friendly technicians out there post stuff on places like manualslib.
