TAZ 6 / Rambo / Marlin questions

I have a question about the TAZ 6 fans and how they are defined / used in Marlin.

Looking at https://ohai.lulzbot.com/project/taz6-control-box-assembly/taz-6/, The Rambo 1.3L board has Extruder 0 Fan, Extruder 1 Fan, Fan 2 (Controller Fan), and two 5v fan connections (E0, E1).

For the existing LulzBot toolheads, they all have only one 5V heatsink cooling fan and two part cooling fans which are wired in parallel on the single toolheads and I believe they are wired in parallel on the dual toolheads because the firmware M106 S255 turns both fans on. If they were wired separately, then I believe you would need M106 P0 S255 and M106 P1 S255 to turn both fans on. Are my assumptions true?

What does the Extruder 1 Fan output connect to? Can it be controlled separately in Marlin with the current conditionals as defined in https://code.alephobjects.com/diffusion/MARLIN/? Could the E0 fan and the E1 fan outputs be controlled separately by changing what conditionals?

I’m guessing that (although this Rambo board doesn’t support a separate X axis) the E1 connector could be connected to a separate toolhead / extruder and the E1 fan output and the E1 5V fan would provide power to those fans on the second toolhead / extruder.