Connectors

These are the connectors on the PSU. You could create extension cables in order to run the machine with the PSU outside of it for testing.

Molex mini-fit jr 6-way is the large 6-pin connector to the daughterboard Digikey link

TE Connectivity Economy 2.5 4 way is the smaller one next to it Digikey link mating connector

Molex 30-way 1mm ribbon cable note top on one side bottom on the other Digikey link

This is the pinout of the ribbon cable:

There are two cable bundles between the two PCBs inside the supply. Each cable is terminated by JST PH2.0 connectors. One cable is 7-way and other is a 9-way. It might be possible to make extension cables to ease testing.

The high voltage wire is UL3239 40kv 22AWG, about 7 feet. This is the infamous "red wire" that's know for its insulation failing. Its internal connection is encased in a silicone potting compound and removal/replacement requires specialised skill and equipment.