I wish I could help you and knew the answer, but I have a friend who works at the Nismo Paddock in Chiba in Tokyo and I will ask him. Good Luck. By the way, did you Bring your GTR in through Motorex?
I am assuming this is to bleed the Attessa system. If so, R33 has a plug near the fuses and R32 should be the same. Unplug it and turn the ignition to on position before opening the bleed screw at the back of the transfer case. Make sure you have sufficient fluid in the reservoir.