Are you sure it wasn't the refulling panel? Sounds like he was disconnecting the fuel line and then replacing the fuel cap and finally closing the refuel panel.
Here's a couple of pics of a refuel panel from a 737 on it's right wing, 777 is on the left wing but has fuel couplings on the right as well.
DSC00058-1.JPG (image)
DSC00059.JPG (image)
Edit:Additional info.