Ref the open spar valves, (LP cocks) I am surprised that the anomaly had not been picked up on the simulator. The FAA requirement to allow the correcting modification, splicing of the wiring, not to be completed until 2010 was probably based on the Boeing cockpit drill being carried out as directed. This appears to be such a simple mod that I question the thought process of however decided not to do the mod asap would not have ever envisaged that the cockpit drill was not being followed to the letter. This lack of communication is always a problem with large companies and I hope that a valuable engineering lesson has been noted. Always check any changes in procedures with the engineers.