I have used an ohm meter that give me 10 ohms on one station that does not work. My Pro-48 indicates the solenoid to be “Good”. But what that tells me is that the solenoid is marginal and will not work. I have a customer with that problem; I’ve ordered a new valve to fix the problem. Might as well gut the old one out while I’m there and give him new solenoid and diaphragm to go with it. Will see what happens.