The motor won’t go in to forward or reverse. The throttle works fine. There is a button on the throttle handle that allows you to throttle up in neutral. This will pop back out when you put the throttle lever back to the neutral position and the boat will then go into gear when you push it forward or back. It seem like maybe that is stuck and won’t let it go into gear??!? Not sure if it would be that or something different. How can I diagnose it?