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Basically unplug the vacuum lines and electrical plug, unbolt it and replace it. Nothing too tough.
There is an internal diaphragm that may be leaking boost past it. It's vibrating in such a way that it makes noise. Think like letting air out of a balloon.
But like I said, it's just my best guess. It's about a $120 trial. Maybe close to same as having a shop diagnose it. If I'm wrong you're out $120 + whatever the diagnosis and fix turns out to be. 100% in your hands.
Alternatively, maybe you can find someone local to swap parts with to test.
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