Coming out of my 2nd winter of storing my Rad Expand in the basement (battery kept upstairs for ease of watching battery level over inactive months). The bike turns on, but both pedal assist and throttle are not functioning. Also, it won't roll backwards, like the back wheel or motor is locked up interally. The brakes aren't too tight and nothing externally seems to be wrong. I can't find much info at all about what could be wrong, and I have no good local options for ebike maintenance that I can find. Does anybody think this might be something I could fix myself? Any tips would be appreciated. Thank you.