Replacing Stepper Motor Drivers in Husqvarna PRISMA

Life on the workbench of a sewing machine repairman.
Zigzag does not work. Is it the Stepper Motor or the Stepper Motor Driver? Here is a video on how I troubleshoot and repair the machine.
The Stepper Motor Drivers I use:
3dsewingparts....
Husqvarna PRISMA parts:
3dsewingparts....
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More about me:
syrep.no/index...
My webshop with parts I make:
3dsewingparts.com
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patreon.com/sewrepair