Audi automatic gearbox problem?

Hi,
     I was thinking of getting a second hand Audi.

But I have heard the automatic gear boxes can be a problem, and very expensive to fix.



Anyone have any real experiences of these automatic gearboxes. Considering A4 A6 A8

How would you be able to detect an early problem on a test drive?


Please help.

Thanks!

I didn't find the right solution from the Internet.

References:
forums.moneysavingexpert.com/showthread.php?t=3838913


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