No, I don't think so.
Capping the blue line does nothing for it.
Capping the green line does nothing.
Being the only one left, capping the yellow line(s) will cure it, I'm sure.
I'm just wondering why pressing the button would affect the vacuum. It has to be the vacuum that is being affected, right? I really don't want to drill out the rivets holding the switch in.

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1982 300CD Petrol/Black Leather