The Z8 is prone to the leather on the top of the dash board coming unglued around the screen heating vents.
BMW show that the dash is a $1300 part and labor is $1200, so to replace the dashboard would be about $2500 for parts and labor.
In an effort to understand this I have put a poll up, so please take a moment to answer it, and if you suffered delamination also please copy/paste these questions, with their answers.
(nb: The build date is on your VIN sticker in the door)
Car #.........................
Build date....................
Date of fix...................
Fixed under warranty.....
Incase you haven't seen this illustration it helps explain why it is such a huge job to swap out the dash, the top section is the tip of a large and complex plastic molding that holds in the entire instrument cluster and the rest of the dash facing, all of which have to be removed to replace the delamination.