Please take extreme caution and be very diligent with your ESD practices.
Error codes should be viewed as a guide to point you in the correct direction. Having it repaired at Segway with the fault logs downloaded and interpreted is the definitive diagnosis. Its possible that you are creating faults to the log that are irrelevant to the initial issue you were experiencing.
Im leaning towards a failed BSA based on the startup process, but after seeing the picture of the corrosion you should rule out the power board.
I have a used power board (23371-00001) that is operational, with the exception of charging function to the B-side CU. If you cover the shipping both ways, I can send it to you and you can make sure this will correct the issue prior to purchasing the part.
PM if you are interested in this.
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