The only electrical issue you might have is power to the PRV solenoid. If you look at your pumps, a small hose will connect the pump control heads together and a line will tee from that point down to the solenoid manifold. The line will connect to a solenoid that looks different from the other solenoids. This is the PRV solenoid. Check the connection for voltage and a good ground. Also, place the controller into backup mode to see if that will supply the solenoid power. The circuit to the solenoid is directly from the backup switch. One side of the switch is from the electronic controller and the other is from a resister.
This is to provide a fixed pressure control when a failure of the controller exists.
Voltage and ground are both on the backup switch. Terminal #2 has a green wire w/yellow stripe, this is the positive side.
Terminal #5 has a green wire w/white stripe, this is the ground side.
Verify both of these wires have continuity to the solenoid and are provide voltage and ground. If this connection is good and the resister circuit has power, you can run the machine in the backup mode without any noticeable problem.
If you want to correct any error with the controller, it requires viewing and identifying the LED lamps on the controller to diagnose the issue. The lights will indicate where to begin troubleshooting the controller systems.
If you do wish to proceed, please include the full CAT machine serial number with your reply.
If you need further help with this repair, please let me know. I will be glad to help.