I'm in the process of repairing two broken Agilent 4395A - Network / Impedance / Spectrum Analyzers. Both have dead 24V power supplies.
I repaired one by swapping in a different power supply. The other one, I was able to repair the supply. Next I'll try to repair the other one.
For the gory details and some general advice on repairing power supplies with no documentation:
http://www.djerickson.com/4395a-power-supply/Thanks,
Dave Erickson