After a hardish landing (the Return To Home function stopped flying about 5 feet off the ground), there is nothing physically broken on the Phantom, but the camera motors do not actuate when the drone is started up.  The camera video is working.  Where should one start with troubleshooting?  I'm hoping a cable or something just got disconnected?

Welcome Tabora ! Try calibrate camera with Dji go app , if not, maybe it is a disconnected cable

Hi. I am sorry for the trouble this has caused. With regards to this concern. As JetSam advised at post #2 kindly please try to calibrate the gimbal of your DJI drone to isolate the issue. If issue still persists there might internal damages that may be causing this issue due to the hard landing. It would be best to have our DJI support team to further diagnose, analyze and repair the said drone. Please note that the repair cost will depend on the warranty period of the said drone; otherwise, valid charges will apply. Thank you.

I can't even find where to calibrate the gimbal.  The Gimbal Status says NA.