...two months after it first discovered an issue with some of the valves in the spacecraft’s service module, the company still doesn’t know with 100 percent certainty what caused 13 of those valves to remain shut when they should have been open... ...the company might even have to swap out the spacecraft’s service module for a new one... “We got very close to launch without having identified the valve problem,” said George Nield, a panel member who previously oversaw the Federal Aviation Administration’s office of commercial space transportation. “Are there any changes to hardware inspection, testing, vehicle processing or checkout...