i have just orded the bits to change the haldex oil and filter. i thought while it was dry i would quickly jack the car up and have a look at it before i do the work next weekend. I noticed fresh oil around the haldex unit, it looks like its been leaking from a black plastic tube where the tube connects to the metal unit. the plastic tube also has wires going to it. iv had a quick search on google and looked at a diagram and as far as i can tell this tube connects to the pump unit. i did not want to pull it off incase more oil poured out! i have pushed it on further and degreased the whole area and i will check it over the next few days to see if it continues to leak. sorry about the long winded post, i would be grateful if anybody can help.