I found the datasheet online after a little bit of searching and found out it has these stats:
- 3000V Reverse voltage
- 2050A Avg. onstate current
- 19kA repetitive peak current
- 29kA surge current
I'm guessing the broken lead is for the trigger ground or something? They don't have any physical diagrams on the datasheet.
Now I just need to find some low ESR capacitors and I'll have the biggest components of a really solid TMS machine.