I just received my Loewe Aventos 3781, and I'm rather happy with it. There is one small geometry adjustment I'd like to make though: objects in the center of the screen are a bit horizontally squashed. I think this can be adjusted in the service menu, but I don't know how to access it. If I press the Menu button on the set, it brings up some controls, and at the bottom it lists service menu, but I can't access it. Three questions: How to access the menu? Is there a service manual available? If not, which setting would I need to adjust?