I'm out of the loop. What did they do wrong?
the "plank" is not just a random piece of wood under the car. there is a bit more but that is a good way to think of it.
after every race the car is checked over. to make sure there is enough fuel for a sample all the needed things are where they should be and all that.
Lewis and Charles were found to have taken too much damage on the plank. this happens when drivers take too much of the curb or bottom out too much and scrape the bottom of the plank wearing it away.
the fact that both of them wore away the plank in the same place is what is truly amazing. and it is form away by a tiny amount more than the allowed amount. there is allocation in the plank to be worn away during the weekend.
they are not the only cars that were checked. they are the only cars to be found outside of the regulation.
I can remember this happening to shumi in the early 2000's as well. but never after that