You have to be careful with what is presented to you in a Documentary, but as others have mentioned, the paper trail alone here is pretty incriminating.
For those that haven't seen the Documentary, here are some points of interest:
1) The FAA safety guy in charge of the investigation into the issue states that there was no tangible evidence to back claims that the parts in question were at risk of early failure. When asked if he had accessed Boeing's own database, where recurring problems experienced by operators are stored and tracked, he says no. The database shows a pattern of premature corrosion in airframes with the Duccomun manufactured parts.
2) The FAA ultimately gave Boeing the all clear. Under cross examination in a pre-court hearing to the present lawsuit by the former Boeing employees, the FAA's Chief safety guy admits that the final declaration, which was supposed to be written by him was actually written verbatim by Boeings lawyers. Boeing admit they had presented a declaration to him, but that he had made substantial changes to it, making it his own.
3) As part of the Air Accident Investigation into the runway overrun in Jamaica, Boeing state in their own report that the NTSB cleared the Duccomun parts from having had any bearing in the incident. The NTSB when questioned about this, deny that they had come to such a conclusion, saying they were still looking into the issue. Boeing when later questioned as to why they had reported this, refused to comment.