A Boeing whistleblower claims that the 737 MAX 9 production line has an enormous volume of defects, citing a specific incident where a door plug detached during flight due to missing bolts. The whistleblower attributes the issue to outsourcing and poor quality control. The incident is currently under investigation, and the whistleblower's claims have sparked discussion about Boeing's production practices. The company's shift towards outsourcing components has been linked to cost-cutting measures and a change in corporate culture.