From what it sounds like, it's the dealer not the Cayman at fault...
The auto feature causing the window to fail rolling up and then roll down half way is a common problem and the solution for it is to 're-teach' the regulator the correct distance to move the window. The procedure is in the manual.
This thread discussed it:
Passenger Window Ghost ?
Did they try this first before they went on to replace things? Also, even if they did... it seems like they are not very proficient at programming using
Piwis.
- Suneet