Sorry for never replying to this, I somehow didn't see it and came back across my own post when I was searching for solutions (again).
At some point I did diagnostics and the pedal power all seemed normal, despite no forward and reverse. I had the idea that the problem was a clogged hydraulic...
I have a 2011 JD 3320 eHydro with just over 500 hours on it. I've been using it regularly of late to move mulch, bush hog fields, tow a trailer around the yard, etc and no issues. When I went to do some tilling today the forward motion stopped suddenly – forward and reverse pedals did nothing...