When I did it, I set the P2 board to the settings of the P3, and the P3 board to the settings on the P2. I didnt have a pen handy and doing it this way would allow me to switch it back if it went wrong.
This means I cant check the settings on the P3 board for you, and as the processor boards dont actually seem to like being removed, I dont want to down the server and pull the board to find them.
I do however remember, that all the switches were off, apart from one. I think it's off,off,on,off. But I'm not sure. I'll find a way to check it and get back to you (I may be able to see the switches with just the top cover removed.