Hi, I don't know about this fault or Skoda's in particular but I'm a retired mechanic so maybe can help a little, so to cover what you've said I think the g/box would have been removed not dismantled, then the cylinder would be the slave not the master, it's the flywheel and loose bolts that seem unusual, the bolts don't just come loose and if they were and the flywheel is damaged I would suspect that could be a reason for the slave cylinder to fail/break. I would ask for more clarity on the loose bolts and expect it to be a warranty fault claim.
