355 F1 actuators/solenoids

My mechanic has essentially rebuilt my unit but we need to replace some of the F1 actuators/solenoids. The unit functions for a time but doesn't maintain pressure. The pump has been rebuilt. I have searched the threads but can't find anyone with access to a used unit lying around. Can anyone help on this. Thanks.

 

I will double check, but I believe that was ruled out. When a donor solenoid control unit was tried everything worked fine. Suspect the solenoids. Thank you and any further suggestions would be appreciated. If someone has perhaps replaced a full unit and has the failed unit laying around I would greatly appreciate hearing from you.