Boeing and NASA disagree, according to the report and comments from NASA officials during recent press conferences.

Their investigation pointed to moisture getting into the valves and causing "corrosion" and "binding," Boeing vice president and Starliner program manager, Mark Nappi, said at a press conference last week.

NASA and Boeing say they're comfortable with this solution.

"We're in really good shape to go fly that system," NASA's Commercial Crew Program manager Steve Stich said last week.

The hangups with Starliner have also cost the company about half a billion dollars, according to public documents.

Meanwhile, SpaceX, once thought to be the underdog competitor in NASA's Commercial Crew Program, has already launched five astronaut missions for NASA as well as two tourism missions.