Zipper access point will expose the power sunroof motor/transmission and the cables, IIRC.
Also...
From the fotos you posted, it looks like your cable tracks can use some cleaning --- grease, dirt/debris/leaves --- as a "preventative" measure. To do that you'll need to remove the panel to expose the tracks. And while you're at it, can remove and clean cables as well.
NOTE: clean both the cable track that run FRONT/BACK and LEFT/RIGHT.
It's a lot of work, but good preventative measure.
On my 83 SC, the sunroof got stuck back in 2017. I was able to observe that one side (driver side) was pulling farther/faster than passenger side. The panel twisted out of square then got stuck. This led me through the journey I describe above.
Eight plus years later, I finally got it sorted out. Hired local air-cooled shop to finish the job. They cleaned the cable/duct tracks that run LEFT/RIGHT, and replaced the power sunroof transmission.
My post on this journey here:
https://forums.pelicanparts.com/porsche-911-technical-forum/951856-83-sc-sunroof-stuck-guide-rails-passenger-side.html