a wheel joint is not a no maintenance item. 70k is a good run on those.
air not out the vents is a simple vacuum check valve replacement. a couple $$ and few minutes to fix it.
plenum gasket is a design flaw in my opinion. fix is fairly simple but is about $100 to do it yourself with an aluminum plenum plate.
jsut remember, you cant get mad about regular wear and tear or maintenance items that you dont keep up on that may fail or result in other problems.