Back in August last year, my clutch slave sprung a leak. It happened after I topped off the fluid - maybe the new fluid reacted with the old and eroded the seals? Perhaps some sediment got forced through the system?
Replacing the slave cylinder seals was a pretty straightforward task. The hardest part was getting the right rebuild kit: there are two cylinder bore sizes common to Amazons - 3/4" and 13/16". Both are available from Swedish Treasures.
I ended up ordering the wrong kit the first time around. Lesson learned: I should have removed the slave and measured the bore before ordering parts.