By the way Mike - I forgot to mention:
When looking up the part number for your Berlingo, there is a warning flag coming up that requires you to contact a Citroen dealer ASAP. It's an after sales campaign that means something needs fixing, repairing or replacing or may even just need a software update. But whatever it is, it will be free and not cost you anything.
An after-sales campaign must be carried out on this vehicle. Advise your client to make an appointment with their authorised dealer as soon as possible
So don't delay, give them a ring, have your VIN handy and tell them you have been advised by Citroen Service that you've been asked to call a dealer for this to be carried out.
I can't tell you specifically what it is, but they will tell you when you call them.