In my case it meant that the condenser blower was not working. I unpluged the refrigerator, removed the cardboard condenser cover and cleaned 10 years worth of dust and grime off of it. Plugged it back in and it spun right up. The mullion is now cool to the touch again.
It means the mullion heater is working. The strip between the doors is called the "Mullion" on "Kitchen Aid" this is part of the refrigeration system. Known as a "Yoder Loop".
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