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AuxSupply-400Vin-to-15V-5V (M2) in HVMotorCtrl+PFC kit didn't open sourced, right?

I can't find any sch or pcb for this macro in controlsuit. It seems looks like a dependent pcb and BOM said it is custom made. So where can I get it? So i can make this kit on my own, thank you!

ps, toooooooooo expensive and far for me to buy this HVMotorCtrl kit.