hl GlenMc,
first thing i would do is make sure the battery is in good charge state.
no bad cells etc. cells have the correct level of fluid in them. Once verified then start troubleshooting. A lot of the time when you get a slurry of faults like that a bad battery can cause it or be the cause of a component failure triggering them.

Now as for the codes...
-Fault 33 indicates Field driver fault P - Fault signal from the driver board. This is indicating some fault in the driver board for the pump circuit.
-Fault 13 indicates IGBT driver fault R - Fault signal from the drive board. This is indicating some fault in the drive board for the drive circuit.
-Fault 11 indicates IGBT breaking R - Checks voltage and current of power circuit.
-Fault 21 indicates IGBT breaking L - Checks voltage and current of power circuit.
-Fault 30 indicates Armature fault P - Checks voltage and current of power circuit.
-Fault 33 indicates Field driver fault P - Fault signal from the driver board.

Like i said, check the battery voltage (under load) and see what's going on with the battery.
Other than that you may have some burned diodes on the drive board(s) and possibly some other issues. The only cause i can think of that would cause such issues in both systems is a bad battery.
If you will report back here with your findings on the battery. i know you gave a preliminary on being above 36v but what does it do under load?
total voltage before use after charge, volts per cell before testing. voltage drop during hydraulic motor load. I have a feeling you have a battery issue. It could be a bad drive or H-bridge board but lets start with the battery.