I did mine around 3 years back, and it turned out that the brushes within the motor had dislodged.. a bit of twisted wire and they were soon back in position.
Fixed the problem, with the air suspension working again!
I also came across the bagpipeandy solution and have to say it seems to have worked for loads of people.
Good to hear your A8 is back up and running.
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Current: 2007 Audi A8 3.0 TDI SE Quattro - 
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