After replacing the drive unit, the car went into limp home mode for the dealer. After running a number diagnostic, and further guidance from Germany, they were able to reset everything, and went through a few days of drive/charge cycles.
We got the car tonight! Our service rep stated that over $20k of work was performed. My wife is happy to have her car back, and I'm happy with a functioning car. It took MB 10weeks and 2 days to fix the car.
'15 B200 ED Cosmos Black
'16 GLE300d 4MATIC Diamond white