From my understandng this was not an emergency, but rather a precautionairy landing, but I could be wrong.... (I doubt that though)
This is what I heard:
At 1:10 mark the pilot not flying (usually operates the radio) says:
"From time to time we have sparks zero from level 3 right, so we need to land to check".
Which would mean they have a ignition problem with the right hand engine and has to be checked... they dumped fuel and landed safely....
According to flightaware it would be a 777-200.... also not sure though