I’m fairly certain they cannot be refurbished and they are no longer available from Renault so unfortunately you are going to have to fork out a few quid (they were never cheap) It is a well known problem and there are threads on here that mention it if you search. I’ll see if I can find one.
Thanks for letting me know they can’t be refurbished , that has saved me abit of time. Also cheers for install posts.
I have bought a clean one off eBay £65 so hopefully this one holds up (almost tempting to buy 2 for the future) ... not looking forward to install but I’m sure given some patience it will come together