Could it be the alternator?
No, what I said was correct. On the 2.8(and pretty much any euro car), the voltage regulator and brush pack are 1 removable assembly.
This is an EXAMPLE, not the actual part you need. Audi A6 Voltage Regulator / Voltage Regulator - On Sale!
Changing it just means popping the back cover off the alternator and swapping out the part. NOW, you need flexible hands to get this done on the 2.8 as it's a tight fit.
Below is just a random pic I found of what the back of your alternator sortof looks like. The pic is with the back dust cover off, and right there is the regulator, held in with jut 2 screws. Unscrew, pull out, put in, screw and your done. Now only if it was that easy. It is with the alternator out of the car, but with the 1in of room you have in your audi, those flexible hands come in handy.
***it's possible the 3.0's alternator does not have a removable voltage regulator, but I highly doubt it. If so it's reason 10123 to avoid the 3.0***

This is an EXAMPLE, not the actual part you need. Audi A6 Voltage Regulator / Voltage Regulator - On Sale!
Changing it just means popping the back cover off the alternator and swapping out the part. NOW, you need flexible hands to get this done on the 2.8 as it's a tight fit.
Below is just a random pic I found of what the back of your alternator sortof looks like. The pic is with the back dust cover off, and right there is the regulator, held in with jut 2 screws. Unscrew, pull out, put in, screw and your done. Now only if it was that easy. It is with the alternator out of the car, but with the 1in of room you have in your audi, those flexible hands come in handy.
***it's possible the 3.0's alternator does not have a removable voltage regulator, but I highly doubt it. If so it's reason 10123 to avoid the 3.0***
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