I have a 2002 A4. Prior to the recall for their ignition coils, I always experienced a similar problem just a couple of days before the coils gave way. Although I do not see the correlation, it happened three times before Audi finally did the recall.
Just a note. Maybe some of the 2003 models may have defective coils.
I actually just had my 2003 A4 in for a similar problem - except the problem bounced between four bulbs... and of course, the day I brought it in, everything was working fine. The did find a problem however - not only was there corrosion within a few of the sockets - they found a ground wire that was damaged. They replaced this wire and I've not had the problem since.
MCB
its is going to be one of two things. it will mostly be convience control unit this has total control of the alarm. could also be the central electrics control unit, this control the indicators.. both these contols units do give problems.
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