So I have ordered a VAG K+ CAM adapter and NDS3 software which will be able to read all the Nissan codes and translate them to human readable - will use that to determine which part of the roof is in error state and preventing the roof mechanism from operating.
This adapter/software is a really good tip as it's < $100 and will do everything that a factory OBD2 reader will do, but for a fraction of the cost (assuming you have a laptop spare to run it on)
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