Oil Leak
 

Hello guys,
Seems that every time I try to do something on this A8L (2002) I run into information problems. I have searched the Bentley manual intently with no luck and I hope one of you guys can help. When changing the oil (and who usually has a 37 mm socket handy?),
I noticed oil leaking from a gizmo on the bottom of the oil pan ( I believe it to be the oil level sensor). I am trying to find out if this thing has a gasket which can be replaced or would it usually leak through the electrical connector. Or, being Audi, must the entire unit be replaced. I will sell my house to buy the part as I really do love this car.
Any input would be appreciated.
AG