I recently noticed a yellow band across the top of my 17" screen (Feb17 MS90D). About 1/4" wide. I never noticed it until I had a whith background on the top half of the screen. Looking through the Forum, I see that this has been reported and that individuals have been able to get the screen replaced under warranty. I contacted Tesla and they'll fix it at some convenient time. All's good. This brings up what might be a silly question - if the screen gets replaced, does the MCU get replaced too?