Paul if you will go buying or looking at this model,i would recommend try all gears with Sport Shift/Tiptronic if its not slipping at 2nd/3rd,these two gears usually goes first...
And usual signs in auto mode,if its not slipping too.
Second thoughts ask him about the which oil using and more importantly if he changing too gearbox filter too and if box has been rebuild'd before.
Here is full spec of this model
http://www.cars-directory.net/specs/.../2001_9/27740/
Jura