Re: "The blue vacuum lines go to an electric controlled switch under the (left side of the) rear seats."

Could this switch be under the drivers seat in the coupe? I see the blue line under the drivers seat and it appears to terminate in a large rectangular box with a bunch of other cables. Looks like it has a black cover of some kind over it. I'll know more today. Thanks!

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Scott in Monterey
94 E500
Smoke Silver/Parchment
OEM