Agilent MXA N9020A dead power supply

[Ahyuan]

Unlikely, but does anyone have any documentation on the power supply for an Agilent MXA N9020A signal analyzer? I am getting 5.1V SB but no 15V SB... power supply is a mess and there is no helpful silkscreen. Figured I'd ask before dropping $600 on a new power supply. Frustrating thing is, the PSU has already been replaced about a decade ago.