Has anyone done this? What was the result? I ask this because of the conversation with Apple about the yellow tinge on my week 50 unit. He said that more than likely replacement units have a greater chance of having the same problem because the parts for the new machine still come from batches that maybe months old. So even if the machine was manufactured this week, it may contain parts that have been on the shelves for months. He also said that if it goes to repair for a certain issue, someone will inspect the repaired unit to make sure it was repaired correctly. He said it would not return with the same issue. So what do you think, has anyone done this to get rid of the tinge?