Audi Digital Dash Backlight

[David.Ullrich at ferguson.com]

The right hand panel on the orange digital dash (yes, orange, not red) on my 1987.5 CGT is out. I can see that the digi part is still working fine, but the backlight is out, making it very hard to read. How the heck do I change it? Anyone know what bulb it needs? Cost? Is this a pretty easy DIY? my local auto electric place want $98 in labor plus parts...should I just get them to do it?

TIA,

Dave
1987 Coupe GT Special Build 2.3 - Anthracite Black
1998 VW Passat 1.8T mit UPsolute (for sale, cheap)