[NextNewell]

Sorry, but I am easily confused. There are two switches in the conversation, the Master switch and the Leveling switch.

Can you confirm the master switch raises or lowers all four corners? If so the answer to your question "So that could explain why the green/black stripe wire from the top of the master switch is connected to that bunch without a diode?" is yes. Also there should be second group connection like that for All Down.

On the leveling switch, I can imagine logic that would power the four travel solenoids when the switch was off. Can you get a pic of the back of the Level switch.

Sorry it took so long, but here is the back of the Auto-Manual switch.  I tested the different contacts on the back with the switch in the up and down position, but only with the switch up did the upper right contact, with the two red wires, have power .  
I'm not sure why the photos uploaded upside-down?