Under the CBS in TIS, differential fluid service is NOT supposed to be on the list of items.

Since it's not supposed to be a CBS item, is it possible that the differential service indicator is due to some sensor in the diff triggering this? For example low fluid?

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2014 BMW 328i Xdrive
2011 BMW 335i M-Sport
2008 BMW X5 4.8i Sport
2000 BMW 528i 5sp