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The investigation shows a fixable problem, but don't count out on SpaceX flying astronauts in 2019. //
According to Koenigsmann, engineers prepared the Dragon’s escape engines for ignition by raising the pressure in the propellant system. About a cup of liquid oxidizer had leaked into the wrong plumbing, and when the pressure was turned on, that slug of liquid oxidizer impacted a titanium valve. Upon contact, the oxidizer and titanium reacted explosively.
Koenigsmann said that going forward, SpaceX engineers would isolate the oxidizer from the pressurization system and replace the four titanium valves with a simpler component called a “burst disc.” He said the impact on the schedule might be “relatively minor,” but said about 20% of the accident investigation remained to be done and that other documented issues needed to be solved as well.