The top display on the cornerpost of my 9650sts is going crazy with digital mumbo jumbo. Combine was upgraded two years ago for 600 series head and got the top display which shows reel resume, contour master, header hyd. downpressure, etc. Deere service tech let me try a putting in a used one he had, but that one showed the same digital crap when I started the combine. The other two displays below it on the cornerpost are reading fine. Any suggestions what else it might be?