Very common on the DE's for the slave cylinder to fail due to the proximity of the manifolds. We can supply a new slave cylinder, stainless steel braided line and Motul RBF 600 fluid which will solve the problem.
I wouldn't bother with the master cylinder I have yet to see one fail yet. The most important thing to do is use the Nissan procedure for bleeding the system which we can include with the kit,
Ewen