He said, she said....Boeing versus Aerojet, putting blame to Starliner's sticky fuel valve problems. Also, apparently this is not the first time for Boeing's Commercial Crew project....
"The feud with Aerojet is not Boeing's first Starliner subcontractor quarrel. In 2017, Starliner had an accident during a ground test that forced the president of a different subcontractor to have his leg medically amputated. The subcontractor sued, and Boeing subsequently settled the case.".....This points to the advantages and gains SpaceX is able to achieve with their vertical integration.
Boeing Co. is feuding with Aerojet Rocketdyne, a key supplier for its Starliner spacecraft, as the U.S. aerospace giant races to test launch the uncrewed astronaut capsule and mend its reputation in the space sector, people familiar with the matter said.
www.cnn.com