Hi,
this thread should be about the very common speedometer display LCD display pixel failure. I know th speedo costs a fortune, the repair is also very pricy, but there are several sites out there selling great spare parts for a DIY repair for all those who feel like trying to fix it at home. Here come a few videos where you can see great manuals. THis pne shows you how to fix the pixel failure with a simple cable replacement:
This other video shows the repair with a brand new LCD:
Enjoy :-)