Robin e-mailed me back very quickly to say you press the plastic bits to release the wires. So easy when you know! Not really intuitive though, it looks as if it would grip tighter if you pressed them in further. Anyhow, the wires came out easily enough, new ones inserted, made sure none of the wires were touching the outer casing (they would burn) and then I screwed it all back up.
Unfortunately, I still have the tCL error. I've e-mailed Robin to ask him if 4 years is a good age for a Paragon SC2 and whether he thinks it's worth fixing any more. It was definitely worth trying a £52 fix when new ones are about £600.
I am therefore reluctantly resigned to not making any more beads before the new year. I only have two more making days left before I will be at the craft market for four out of the following five days and then I will be getting ready to receive guests on the 25th; after that I'm having a rest!
We're getting our Christmas tree tomorrow so it's time to deck the halls, make merry and forget about kilns. Shame I don't feel Christmassy at all yet!