2015 dodge journey air conditioning work on bottom but not on top. How to fix it

The vehicle utilizes electrical motors that react from setting changes to move the various doors in the heater / AC plenum behind the dashboard, which allows the "mode" of air flow to change from and to different areas, as well as change the temperature and the introduction of outside air as needed. Something has failed with either one or more motors, the controls, wiring, or the plastic of the plenum itself; inspection and diagnostic testing is needed.