Stilo Dynamic 1.6 5 door Instrument cluster failure.

Whole thing "Died" no panel lights,instrumentation,computer display etc.

Local main Fiat dealer are replacing it but nobody there has ever done
one before as it is claimed to be the first time they have heard of it
happening.

Two questions:- Is there anyone out there who has changed one or had one
changed who would like to comment with their experiences?

Also, has the mileage reading been permanently lost or can the computer
save it?

Thanks,
Stuart