Old Arburg Allrounder 320D

Hi everyone,
I have a serious problem with my Arburg Allrounder 320D not moving at all.
I checked the voltage coming out from card which supplies proportional valves Y50 flow, Y51 pressure and is zero volts when pressing the open mold button. Replaced the card 79.874 which controls them and still the same problem, I checked if the valves are being activated from the program by pressing the valve symbol button to see if they are being activated and they are activating on screen, which I don't know is which card activates the proportional valve card.
I also replaced the power transistors which control the valves.
I don't know what else to do as I don't have any schematic of the electronic control system but I have the electrical one.
Does anyone have any suggestion on what I can do?