Dead instrument panel and dash lights

[Matt West <audi@tdraft.demon.co.uk>]

Thanks to everyone you mailed me and welcomed me to the Quattro list
the other day.  I now have a problem with my 1989 Audi Coupe that I
hope someone can help me with.

All the back-lighting lamps in the main instrument panel, heater
controls and auxiliary instrument panel have died.  As they all went
together it would indicate that a fuse has blown, rather than bulb
failure.  The fuse (which also protects other circuits) in the main
fuse box is OK.

Does anyone know where I should check next ?
Are there any hidden in-line fuses that protect this circuit ?
Could it be the connection to the side light circuit that activates
the instrument panel lighting and if so, where is this connection
made ?

Matt.
Oxford, England.