Seems like Boeing could benefit from a Netflix style chaos monkey approach. Formalize a red team with the power to sabotage parts and processes throughout the build, measure downstream inspectors' responsiveness and demote and promote accordingly. Isolate the red team from the rest of the corporate culture, reward them in proportion to estimated lives saved, and arrange for their reports to be made public without a filter. Anyway it will take some such radical reform and transparency to regain trust.
https://en.wikipedia.org/wiki/Chaos_engineering