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What does the 5th Diagnostic LED on a 2017, 27-inch iMac do?

What does the 5th Diagnostic LED on 2017 27-inch iMac represent? I already know what LEDs 1, 2, 3, and 4 do. Any idea what the 5th LED does? The 5th LED is new on the 2017 27-inch iMac. The 2015 iMac only has 4 Diagnostic LEDs.

Thanks.

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