If you use the search facility you will find this post.
https://forums.segwaychat.org/showth...104#post187709
You will probably need to send your machine back to the factory for a repair.
If it is a controller board issue, they will probably replace that, and any other parts that are of concern.
The factory rarely diagnoses faulty assemblies, they just replace them.
It is a modern disease.
My wild guess is that it will cost you between $1k and $2k.
It is likely to be away for a month, or more.
Nobody really wanted to give you that info.
Good luck, and I hope I am wrong on my estimates.