I think it's pretty obvious we are losing pressure so not sure what that would help.

I'm mostly looking for items outside what I mentioned in that area that can fail.

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2004 E46 M3 Silbergrau - Mein
2004 E53 3.0i TiAG - Wife's
2002 E46 330i TiAG - Sold
1999 E46 328i Schwarz - Sold
1961 VW Beetle GolfBlau Ragtop Sdn - Mein