Interesting. I just finished with a thorny hydraulics problem on a 9870 Combine. It turned out to be a faulty sensor. Part of my troubleshooting involved buying a new sensor, and swapping out each sensor in the system one by one with the new unit until I was sure they were all working correctly. No calibration needed. When i do need to calibrate a system i can do it all from the onboard computer.
What a systemic downgrade in capabilities.