Berkeley Nucleonics Fast Pulse Generator

[Omicron]

I'm trying to repair a Berkeley Nucleonics 201E fast pulse plugin for their 6040 pulse generator (https://www.berkeleynucleonics.com/model-6040). The issue is that the output is low in amplitude and it's not possible to set the low and high levels of the pulse anymore.

There are two DACs in this device. One sets the source voltage of the output GaAsFET and thus determines the low level of the output pulse. The other sets the drain voltage and so determines the high level. The circuit between the DACs and the transistor seems quite involved though having a bunch of OPAMPS and power transistors in some sort of control loop. I'm still trying to figure it out.

Nobody happens to have the schematic for this plugin? I've asked them but they say they can't provide it anymore due to company policy.