If your Zed is the model with the slave cyl. on the outside of the gearbox, and not the internal concentric slave, then I would recommend the following.
Replace the rubber hydraulic hose with a braided one and swop out the slave cyl.
Flush out the old fluid which will now be boiled and bleed as required adding new fluids.
Slaves, lines and fluids all in stock and good to go same next day.
Alex.