In true ferrari style.... window jammed down, would only move from full down to abouve 2 inches from full down. At end of day, the window managed to go back up, but looked as if it was jammed onto something in the door. Thanks god it seems the regulator is out of cause. I know 456 are well known for such window issues but as far as I knew 550 were immune from these problems.... any idea or views ?? Sometime i wonder why ferrari doesn't ask the MB suppliers to do the minor electrical stuff..... at least it would work !!!!