Oil leak from low pressure sensor?

[DavidR8]

I have a small oil leak that I'm very sure is coming from the low oil pressure sensor. It is behind the cylinders on a 2006 955. There is a small metal line, maybe 1/4 in that runs between the sensor and the top right side of the back the head. I'm thinking the line is an oil return line and the sensor is for oil pressure. Pg 8.12 in the service manual seems to support this theory.

It seems to be 22mm in size. Unfortunately I only have a shallow 22mm socket and this will need a deep well socket. Crap, more tools :)
The first pic was taken from the left side of the engine, the second from the right side.

[Bixxer Bob]

David,  I'm assuming you've wiped it and left it for a few days to eliminate any chance of it being residue?

[DavidR8]

David,  I'm assuming you've wiped it and left it for a few days to eliminate any chance of it being residue?

Just wiped it down last night but she may get a day or two of rest as its chucking down rain here.   

For oil to go past the sensor and up to the head it will obviously need to be running. I'll fire it up tonight and have a close look.