V70 III door wiring broken

[Prawo Jazdy]

I’ve got a 2009 V70. I’ve got the issue that the creator of this video found: (21:57)

https://youtu.be/Kfnhy0nCaRA

…except my red wire is completely broken. What’s the solution to this? Remove the wiring harness/loom for that door and repair? Is this in any way DIYable?

Experiences or suggestions welcome, cheers.