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Likely not have to take the heads out. Probably take the intake manifold off and replace its gasket if that is the source of the leak. Or could be something along the intake. I'm not super famliar with the M104 so someone else might be in a better place to comment on what all is needing replaced.
On the M103 (M104's predecessor) there are a number of potential vacuum leak sources. There's the idle air system, the giant boot near the butterfly. Etc
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