I removed the magnets from the back and let them hang, I can't remember exactly what else I had to do, but took pictures while tearing down, maybe they'll help:
https://picasaweb.google.com/109644016826076831238/20120523NoFear?authuser=0&feat=directlink
Pictures are in reverse date order so go to the end to see the beginning...
I removed the subway ramp and cleaned, but I bought the machine with all new ramps so I have several old ramps (not the jump ramp) if you end up needing one.