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If there is a service bulletin and the mechanic knows about it surely he must know what is involved.
Did you actually ask him what can be done rather than expecting him to tell you?
If there is potentially a faulty valve in the servo line presumably this is the place to start.
If your mechanic does not know what to do or is unable to help find someone else that is more knowledgable about BMW's and get them to take a look before you hit something / someone!
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