Hiya,
I'm not sure how much help this will be since I have no experience with the new e hydro but I would think that some good old fashion troubleshooting will net something.
!) Tell the tractor it's being naughty. (That works for my 2yo with her toys)
2) ignition off, cycle both hydro pedals completely a few tiles slowly, wait a few seconds, try it and see if it goes away.
3) Grovel on the ground under the hydro pedals and make sure nothings disconnected, if not, wiggle the connectors, try it again.
4) Disconnect the neg terminal of the battery and let it sit for at least 30 minutes, that should reset the module, reconnect it and try again.
5) Go back inside and watch one of the football games on today and call your dealer in the morning, I'm out of ideas.
Of course, I know nothing of the specifics of this tractor, these are basic steps I would take.
Hope it helps,
Tom