Thanks to Andy and all the UnpluggedEV group for working on this solution together. We've gone from nearly a day to just 10 seconds in weeks. Amazing work!

Here are the steps.
Start charging the car.
While charging turn on car (it won’t go ready because charging)
Disconnect 12v battery
Disconnect EV charger
Car will die
Connect 12v again and you’ll have ev charging service required messages
BMU is now reset and will show 40Ah
Turn car on and off to clear EV Service message, battery will now drop to 38Ah.

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