Unlikely to be the bulb - all Audis of this vintage do it - both the A6 and S8 are similarly afflicted. A light thump in the area of the unit, or rocking of the switch back and forward will usually get it working for a while.
Was going to post a similar query as to whether anyone had an effective long term solution as I'm sure I've previously cleaned the contacts on the A6 with no effect....
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
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