I've pulled the engine and DSG transmission from an Audi A3 Quattro. From the research I have done, it's an EA888 design - it is labelled as a CCZA which I believe is pretty much the same as as CCTA but less some US-specific smog control.
With the engine now easily accessible, I'm thinking about what to check/replace before it goes back in the car. There was nothing inherently wrong AFAIK other than the radiator/condenser being accident damaged when I purchased it. I don't really want to go crazy and open it up as I want the car back in driveable form soon, but I do want to do things that will improve driveability/reliability and to some extent performance. So I'm seeking suggestions, which I'll document here.
My current list is:
air filter & engine oil/filter: oil is currently drained and simple to do once engine back in.
DSG oil & filter: as above
spark plugs: remove, inspect and replace
coolant pump: these have a habit of failing. inspect for leaks
turbo diverter valve: inspect for wear/damage