2.7t boost leak

[Bluemerlin]

Just got my second a6 2.7t and it's driving like it has a boost leak.

I've put the boost tester on it, and the leak sounds like its coming from under the intake manifold here. Before I take it to pieces I'd like to have the new part ready, so looking for guidance on what it could be.

When I last had a 2.7t the DV to get was the 710N, this one has the 710P fitted, are they the recommended ones now?

 

[Samuel c5 Q]

I got the 710N for my 1.8t as was recommended as uprated/better internals etc etc.

My old one is in the bin last week and I never checked it.