On the vac line to the trans having a slow leak, I believe that is supposed to be that way, since it was designed as a metered leak through an orifice and variable valve (the white one on top of the IP).

Looking at his results on the ignition switch, it sounds like it is possible that it is leaking as the switch changes positions, but holds at the ends. Seems like the vac in the system would absorb that very quickly though. The other thing he might be seeing, is the absorption of the ambient air in the shutoff side of the switch, since that goes to atmosphere when in the run position.

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale