Banebots 42MM 36:1 Gearbox Ratios

[Madison]

I'm presuming that these are built from three planetary gearsets -- one 4:1 and two 3:1. Does anyone know if this is correct and which of these stages is the final reduction?

I am trying to source a replacement gear set, and I again presume it's the final stage that failed since that's what common sense suggests. Banebots has very limited stock right now and I want to make sure I can find them something that has as many replacement gear sets as possible.

Also, if anyone happens to be sitting on a 42MM 36:1 gearbox, let's talk about what it'd take to overnight it to Portland for me.

This isn't for our team, for what it's worth, so I have very limited knowledge right now.