1. Try This:
http://www.jp-80.com/fa/fa.html
2. And this:
http://www.synthtopia.com/content/2009/06/30/van-halen-jump-demo-oberheim-obx-a/
3. Or:
SCROLL THROUGH ALL THE SOUNDS LIKE THE REST OF US :-)
Sorry, I haven't tried to find one for Jump yet. Let me know if you get one ;-)
I would recommend downloading and installing Synth Legends Pure for more options, as well as EXP 02 the Ultimate Keys collection.
Neither specifically have the Jump sound, but some are as close as any of the internal sounds. I think you're pretty much going to have to tweak anything. So find something close and work with the Attack and Release times, and then maybe thicken it up by detuning, or using octaves, or putting two Parts together.
He apparently ran it through a Marshall so that probably added something to the sound so even if you found the perfect OB style patch, it may still need some extra fairy dust.
Sorry I can't be much more help than that. I've found the FA really doesn't do "iconic" sounds very well. It's looking ahead, rather than looking back. But a few, like my first link above, are creating sounds for it.
Good Luck,
Steve