 Boeing invited journalists to visit some of these facilities near Seattle, including the factory where it builds the 737 MAX. And it's the same factory where Boeing employees failed to correctly reinstall the door plug panel that later blew out of Alaska Airlines flight 1282 in midair back in January. There was a tour of the factory floor where Boeing's leaders talked about lots of changes that they are making to make sure that an incident like that cannot happen again. So far, this sounds very innocuous. What was the problem?