I have a problem with my clutch, the bleed valve is leaking from the slave cylinder. It's a TD4 so the slave is inside the gearbox. Now I don't really want to be going replacing the whole slave cylinder if it can be avoided. Is there anyway to replace just the bleed valve itself?

It's leaking at the 13mm nut. Obviously the seals on it have finally worn.

Has anyone come across this before, can i avoid a huge garage pay out?