So to update:

I can now see the holes in the pcb where I can reach the VR101, VR201
etc. (The lighting in my room is not so great).

However I still totally stuck with the Stretch tuning part. I think
the instructions are totally unclear.
I can't tune the other oscillators until this part is fixed.

If anyone can help me I greatly appreciate it!

cheers,
Danjel