My S77 auto header height controls and auto tilt aren't working (9250 draper head). I've been through header and draper calibrations multiple times. On the screen it intermittently shows the tilt and height jumping all over and as soon as I turn it on I get errors coming in (header right sensor open, header left sensor high, header right sensor high, tilt error, etc). I'm also getting a can communication error on my separate agleader monitor that is only used for guidance. Any ideas on what's wrong or how to fix it? The tech has been on it for a day with no luck. Thanks.