A.
anwered by: canteau
The DT Swiss 240 Technical Service Manual is available here:
https://dycteyr72g97f.cloudfront.net/uploads/H240AAIXR36SA4749S/MAN_WXD10000000896S_WEB_EN_001.pdf
And includes when to use which tools. For general service, you do not need these tools, however, they are required for bearing service or replacement.