Send a notification (e-mail) to the previous technician, when the technician is changing?

Send a notification (e-mail) to the previous technician, when the technician is changing?

Hello
What script or notification action can I use to inform the previous technician, when the request is forwarded to another technician.
I started with a nuew custom trigger with these conditions:
Now I need help with the script oder notification action to inform the previous technician
Thanks and regards,
Markus


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