Website, DB, & Software Developers

The only sane answer is It depends. If there is a paper trail then the election should be able to be audited.

At this point you don't need a programmer, but rather a statistician and perhaps a lawyer. You will need a catalog of all the way the numbers are funny.

As to how it was done, the machines will have to be submitted to someone who is accepted in a forensic environment, this is a crime and evidence needs to be collected. How traceable any tampering is depends on the skills of the person doing the tampering. The immediate goal is to secure the machines for inspection. The path to that I suspect is through the courts.

Good luck and if you have any technical questions feel free to ask.