PISMO Powerbook G3: Pressure on wrist rests turns off

Hi,
I just revived an old Pismo and it's working great, but I'm still stuck with the same problem. Whenever I put pressure on the wrist rest near the track pad, the computer immediately shuts off. If I put pressure anywhere else, including on all the items under the keyboard, I have no problems, so I feel like I've narrowed it down to some sort of loose connection/cracked board or something under or near the trackpad.
Is there anyone that's into Pismo's that might have an idea of what might be causing it (and how to get to it--I've been reading a great take-apart tutorial here:
http://homepage.mac.com/sysop/PhotoAlbum7.html).
Thanks!
Bob

Bob,
Here is a picture of the top case which includes the trackpad, etc:
http://www.ifixit.com/PowerBook-Parts/G3-Pismo-Upper-Case/IF106-006
Here is a picture of the power board which lies under the trackpad:
http://www.ifixit.com/PowerBook-Parts/G3-Pismo-Power-Card/IF106-008
If you were to disconnect the trackpad ribbon cable, you may be able to eliminate the top case. See step #32 here:
http://www.ifixit.com/Guide/Repair/PowerBook-G3-Pismo-Upper-Case/31/11#s79
You might also try this: Grab each side of the powerbook with the left and right hands away from the sensitive area. Now provide a little twisting and bending to see if the 'book shuts down.

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