Please help asap. Possible Slave cylinder

[Corgimark]

Hi all,
I have a 2001 swb 2.0 fwd durotorq di engine.
There is a pipe with a bleed nipple going into the top of the gearbox.
Last night the van decided on my drive as reversing to stick in gear, fluid come out under the gearbox.
The fluid looks like it is coming out of the bleed nipple.
Is there anyone in the Northumberland area who could help me asap, I am meant to be driving the van for a charity run to Bulgaria on Sunday, and at the moment it won’t go into gear…
If it is the slave cylinder does it need the whole gearbox out? It is a 5 speed not 6
Is there anyone who can help please?
I am trying to upload pictures but it won’t allow me…
Mark
Any advice would be appreciated

[Corgimark]

So I have found the part that I need, it is only the pipe with the star head screw heads on… can I just replace this part?
Obviously I know it is going to mean I need a magnetic driver and lots of hope the screws don’t drop inside…but does anyone know if it is realistic that I can change this part?