While some owners have reported success with their DIY-repair (of an already erratic touchpad), it seems that most eventually report that the issue returned. Personally, I've come to believe that once the ground has failed, the touchpad PCB may be permanently damaged and can no longer self-calibrate as designed. In situations where owners RMA'd the unit and got it replaced, but Asus techs followed the same installation protocol that the factory used, there seemed to be a decent chance of the 2nd one failing as well, for the very same reason as the first.
The one sure-fire fix that I have seen is this: A brand new touchpad installed with a proper ground. If it never has a chance to fail in the first place, there's no risk of PCB damage.
@shadowen2: Touchpads aren't all that expensive. If you can find the appropriate unit for your particular laptop, it might be worth your while to just go ahead & order a new one.....and install it properly. That might save you a lot of time and headaches.