It could also be locked in forward. That would explain the motion. I would do a Conventional reset, and than a Factory reset on the engine on the main line. I would then put it on the siding with toggle off. Power up tiu then power up siding. At that point engine should start up, but not move. If so, it was just locked in a direction.
All you need to do is press shutdown and the engine should shutdown, and you now should have DCS control of the engine. Or press start up and commence operating engine. G
