First thing anyone will want to do is find the leak. As you say it could be the bag, or valve, or even fittings or hose.
I bit the bullet and purchased an ultrasonic leak detctor because I do not like spraying watery mixtures around and watched them drip on me.
Check is out if you have time:
711-202-G1 Inficon Whisper Ultrasonic Leak Detector
It beeps when there is a leak and it even has headphones too. It should be able to find the leak quickly for you and then you can decide how you want to proceed from there. The seats on the solenoid valves are know to harden and leak. Good luck. Russ
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