kaokao
On July 11 NTSB Chairwoman Deborah Hersman stated:
"There is no anomalous behavior of the autopilot, of the flight director, and of the auto-throttles, based on the FDR (flight data recorder) data reviewed to date."
With over one thousand 777's in operation, the investigators would have immediately informed the operators if a fault were posing a significant risk.
And as several have explained, it is the pilots job to override the automation if needed and fly the plane.