Manufacturers Update Notification

[Dengieken]

I recently received a text from Citroen about a "Manufacturers Update."
I contacted my local dealer who told me my 2015 berlingo feel edition 1.6bluehdi 100 EGS Stop start should be booked in for replacement of the Adblue wiring loom.
I booked it in & the loom was replaced while I waited for about an hour.
Has anyone else had this done & does anyone know why the work was required please?
While mentioning Adblue my car uses 1 litre of Adblue in about 600 miles. I've read that, when Euro 6b
Comes in in a year or so Adblue consumption with increase by 2-3 times!