V70 - what could possibly go wrong?!

[Zebrs]

Been to see a V70 which seems decent on the face of it. It's a D5 SE and appears to suffer from that most common of Volvo problems relating to the dash not working, specifically the message screen. When I turned it on the yellow warning light came on and went out shortly after but I cannot read the screen to understand the problem.

How wide is the range of issues covered by yellow - is it just screenwash and bulb issues or are we talking potential abs and worse? It's a private sale and I do not have any diagnostic equipment, am I going to lose my shirt taking a punt on this?