By Simon Hradecky, reported at The Aviation Herald: A United Boeing 777-200, registration N794UA performing flight UA-915 from Washington Dulles,DC (USA) to Paris Charles de Gaulle (France), was enroute at FL380 about 400nm east of St. John's,NL (Canada) when the crew decided to divert to Gander,NL (Canada) due to a hydraulic leak.