lx 885 computer problems

Hi, I have a New Holland LX 885 with the computer will not run it diagnostics. The machine will only run on the service switch and after started will shut down when you flip the switch to run. Of course the hydraulics will not work. I do not believe it is any of the switches, seat ect.(checked and replaced some) Because the computer does not run its own check -I assume it is the computer. Who rebuilds them or any ideas would help.

Thanks Much
Steve

lx 885 computer problems