No need for a service manual. There is e.g. a [link|https://youtu.be/3UmVmbdtIo4|video] (in german, but it´s very clear). Opening here, first steps. [guide|135580](also in german). Replacing the grinder is rather easy.
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=== Update (30.03.2022) ===
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And [link|https://youtu.be/CswlYHTMjho|this video] for your model.
No need for a service manual. There is e.g. a [link|https://youtu.be/3UmVmbdtIo4|video] (in german, but it´s very clear). Opening here, first steps. [guide|135580](also in german). Replacing the grinder is rather easy.