Extract Bitlocker Clear Key?

Hi,

i got 2 Bitlocker encrypted drives on whom Bitlocker itselves is disabled so that there must be a Clear Key stored on the drive. I can access the Data with Magnet Axiom, witch autodiscovered the Key, but I want to run some other examinations with other tools on it. So my question is does anybody know where exactly the Clear Key is stored?

Thanks for any help

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