Considering that "The safety of our airplanes is Boeing’s highest priority," is true, and also the level of scrutiny they are under right now, should Boeing not have caught this new error before submitting the aircraft for review by the FAA?
Methinks that they should be very, very thorough in their next set of tests. If it passes them and fails again with the FAA passengers will likely lose what little confidence they currently have.
....and yeah, another accident with more wrongful death suits would hurt them financially. At least they will pay attention to THAT.