New user with problems on old customer equipment

base: c71a12: startup check error: phase 3 or multiple phases is unconnected or not working

There are other issues but this is the starting problem I have. Someone else had partially taken apart the robot before I touched it. Some guidance in tracing this problem would be helpful. Is it a standard message and there’s a step I’m missing? Already have power cycled multiple times.

Also, they appear to have a nonstandard setup on the teach pendant HMI. I can’t see the header and footer that should be there based upon the manual. Is there a shortcut to get back to the normal menus?