PS Audio M500 power supply schematic?

Does anyone have a schematic for the PS Audio M500 power supply that came with the 5.5 Preamp?

I have a 4.6 preamp which still works well, but the power transformer in the separate power supply is buzzing. I have sourced a new torroidal 28v-0-28v transformer, and built a nice replacement power supply. The optional PS Audio M500 power supply apparently contained a few additional components: 2 1uF caps, a small rectifier, a bleed resistor, etc
I am looking for a schematic to follow to add those parts. Thanks.