I just had to replace my vacuum line that connects the two combi valves; it's made of hard plastic and shattered like glass as I tried to trace it to its terminus. It was no doubt already broken/leaking. I used silicone soft vacuum line and saved the OEM giant thick "insulator" connectors; we'll see how that goes.
Generally I'd recommend doing one at a time and take lots of pics first.
BTW My DTCs persist (LEAN CONDITION BANK 1 and TWO) , not sure it's not a bad O2 sensor. There's also a vacuum hose going to the transmission as well as one to the rear right fenderwell(!) which I am dreading analysis!
Good luck,
-Tom
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 I'm in love with a car. 
2004 4.2L Petrol A8L
Sage Green/Black (one of only five D3s thus colored sold in the US)
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