You are not going to change guides and lap the valves yourself, are you?
Just take it to reputable cylinder head shop and they will sort everything out for you. Not sure about 40V engines but on 32V valve guides do wear a bit same like most Audi/VW 4V per cylinder of the same era. Head shop can change them with improved bronze alloy that practically does not wear, I think original on 32V are brass.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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