Hi there - interested in your eventual fix? I have the same model of Fabia mk2 it sounds like - electric windows front, manual windows rear, power mirrors. They all stopped working a few months back (car passed its MOT with them not working which was nice :). I had the classic broken wires in the door and this week replaced the harness with a new one from SKODA. all fitted perfectly. Windows still don't work.
Tried all the fixes suggested on these pages. Using a key externally in the lock mechanism the windows do drop fully and raise - the 'comfort fix' operates the windows (so the mechanism & power is good) but doesnt reset the system. I pulled the fuses and reinserted to mimic disconnecting the battery but plan tomorrow is to do just that.
I stripped and cleaned the drivers door switch - actually it looked pretty good but I cleaned the contacts anyway. Great to read all your work above - interested if you eventually got the power windows working?