Are the gear & neutral selector buttons on the control box supposed to click down and stay down (and/or push up the other buttons), or are they just pushed in to select a gear and then rebound? I'm asking because I've just acquired one of these and I'd rather find out whether it needs work before I hook it up to the motor and boat. The neutral button is down and the other two are up, and nothing moves more than a few millimetres (1/16")