According to the problem analysis result done by TSA, you can directly begin the subsequent troubleshooting process from the corresponding potential root cause.
1-6-1-1 - Follow the right order (see picture below) to reassemble the blender cup, make a drink, and verify if the shaky issue has been solved.
- Result 1 - The blender cup stays steady during blending.
Issue closed. (Root cause: Assembling the blender cup in wrong way) - Result 2 - Still shaky.
Escalate to FAE.