The Society of Professional Engineering Employees in Aerospace (SPEEA), a union representing Boeing engineers, filed a complaint with the National Labor Relations Board (NLRB) on Tuesday (Apr. 23) on behalf of one of the two engineers seeking to uncover a report from Boeing’s internal investigation into the incident filed with the Federal Aviation Administration (FAA). According to CNN, the union alleged the already embattled aviation company retaliated against the two engineers, who were working with the FAA to provide manufacturing insight. SPEEA said in a press release, also released Tuesda…