You need to try to tighten not overtighten your solenoids. Turn the firmly righty. Check your bleed screws for tightness. If this does not help you will need to either get into the valve or cut it out and put in a new one. But if you are not sure about how to tighten a solenoid (may want to read manuals or call somebody). In this market it sounds like a repair of 150.00ish.
Or you can try your self and save some coin!
Good Luck