@tldickerson, LTE card would be an easy fix, but not a short one. Means pulling the dash trim, the MCU, breaking down the MCU, swapping the card, (tech, don't forget to reconnect the antenna), (that could be it too), reassemble the MCU, re-install the MCU, reinstall the trim. Don't forget the cursing when one slices open a finger on bare metal.
The SC might just take a shortcut and swap your MCU2 for another while they have it out and want to get you done and gone. Your install was recent? They might see it as a warranty of MCU2.