Yes, first you need to undo the two bolts that hold the pullies and eye strap for the lower block. You then need to get a large screwdriver and whilst pulling the rope
ease out the plastic wedge.
Looking at it you would think that it's one continuous piece of rope but it's not!
The ends of the rope are trapped in the traveller by these two wedges.
When you replace the rope make sure you get exactly the same size as the original or else you won't be able to force the wedges back in if its too thick.
Hope this helps.
BTW, it was a complete pig to reassemble