I believe it was UA885 to Osaka. I know this only because the ATC communications have been on the news several times..the pilot of UA885 alerted the tower that he saw people had come off the plane and were walking around and that some of them looked like they were in distress... and the tower said something like "United 885 heavy, help is on the way".

I have no idea how long they sat there before returning to the terminal.