Thank you for that information.
This is more than likely a bad cable connection if they all failed at the same time, i'm not sure if you knwo this or not lol.
But if they failed one at a time, as I expect, then the keyboard for this one shoudl be replaced complete. Its pretty easy to do with no soldering required;-)
I will help if you are a little handy and have some basic hand tools to do this.
I will research to locate the best place to get the part and I Will be back in touch with you when I have that for you.
In any case, I will stick with you until this is complete.
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Thank you and have a great day!