Yes, it seems like my issue was different. There were issues on the 5V lines and they traced it to a faulty Valvetronic motor so they replaced that and the accelerator pedal module. That has cleared everything so I suppose the diff lock error was probably triggered by a fault somewhere else in the system rather than something with the actual diff. I don't think there was any software update for me, their notes don't include anything and I still have all my coding.
I think the transmission issue was probably also just a limp mode due to faulty readings.
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