I mentioned on another thread, we need to see video of this actually happening. Stories like this pop up in all recent elections.
..the problem here, and why we need video, is what they are describing is a very messy hack on the machines.
A good hack wouldn't change the votes where the voters can actually see the change and put up a red flag to problems. A good hack would simply change the vote totals outside of the voter's eyes, as the tally is uploaded.
As soon as the Amarillo story popped up, several people on our local news station's website jumped up to claim they saw it happen in our county, yet the report could find no case where anyone complained formally to an election judge. The accounts that claimed they saw it happen appeared to be all troll accounts.