Hi, everyone! Sorry, I was busy for some days, but here is my photos (I put in my cloud to make them alive for a long time, so only links and you should remove spaces, because of rules of this forum I need to have 15 posts to give you links). There is not all phases and parts on it, but may be the most important.
Important notice: everything you do - on your own risk. You will need some special instrument and skills.
For beginning: remove door panel (good instruction here: no1wok. co. uk/ cupra/ dpf.pdf).
To remove door lock you need M8 XZN (Spline) bit.
Door lock contains two parts: electrical and mechanical. To separate them you should remove all screws and disclose electrical part (it has some glue or sealant, so do it carefully and with some metal flat tool). Why? These two part connected by two details: one of this can be left inside electrical part and disconnected from mechanical without any problems (position 2 on photo), but another one (position 1) hard to disconnect (I broke my one, hard to repair) and so you should left it in mechanical part but extract it from electrical.
Here some photos to understand how it works at all.
yadi .sk/i/H9dWWOw_kEd5G (arrow 1 for inside and 2 for outside).
These three photos show door lock in "lock-position":
yadi .sk/i/9HoMTfIakEdBk
yadi .sk/i/v0XMkx_GkEdDj
yadi .sk/i/WjRS-elxkEdE2
These two photos show door lock in "unlock-position"
yadi .sk/i/uIpAs-hkkEdGm
yadi .sk/i/cAz5AYAukEdH9
This photo show electrical part inside (without motors):
yadi .sk/i/7s7nxinfkEdHq
My recommendation: after removing lock from door take away a cover of mechanical part (one screw) connect lock to 12v of car (or another source) and check, how it works for you. In addition do the same thing after assembling of lock, before installing it in the door.
For me
problem was in bad contact for electrical motor. I assembled all back after checking that motor working good (connect to 12v only electrical part) and it was ok for some days, but now (may be after some shakes on the road during driving) it doesn't work again. I will try again, may be add some layer between motor and housing to make motor position stronger. Therefore, if you need more photos (or even video) I can make it for you next time.