JD 790e hydraulic system staying on high pressure

My rig 790ELC is staying on high prssure to the point it is overheating and won't rev up freely. It has less load on it using functions. I changed the output pressure sensor as fiddling with its connection had seemed to help before but it made no difference. I'm afraid it is something in the computer controls but want to do what I can before calling a dealer. I pulled both computers and the red lights are blinking steady with no Morse pattern. From reading here they are known for gremlins....

JD 790e hydraulic system staying on high pressure

JD 790e hydraulic system staying on high pressure