Look for my posts about vacuum diagram, will have pictures to show you what connects to what. also, another thing that will help you is to download the Porsche PET from their web site. It has all of the parts, pictures & part numbers. Easier to see it then describing.
Pictures also help with what you are referring to.
Sounds like someone has messed/changed things but hard to tell from just your description.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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