2002 a6 2.7T slipping clutch?

erq

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Hi!

I've owned my a6 for about 6 months now. Recently i helped perform a big service on the car: spark plugs, waterpump, auxiliary waterpump, toothed belt, serpentine belt,... The works. We also fixed a leak from the rear diff and changed the gearbox oil. Since then it looks like the clucht is slipping. Revs go up and ik takes a while before the car gets up te speed. It still has all of its power though. It doesn't happen all of the time and not always in the same rev range. I'm baffled finding an explanation how this could happen. Symptoms occured immediately after restarting te car which i find strange.

Is it possible we overfilled the gearbox and oil got on the clutch causing the slip? Or does anyone have another suggestion? Where is the rpm measured exactly?
 
No ideas?

If i disconnect the N75 valve (no boost) the symptoms are gone?
The slipping (jump in rpm's) is accompanied with a whistling sound, but only at full throttle.
 

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