If some fluid ended up on the ground, it is possible there air in the system. The way you work air out, is to run slides all the way out and hold for a couple seconds, and run all the in and hold for a couple seconds. You may run the slide all the way out and all the way in several times to work air out.
If the solenoid was clicking off, I would think you hear it or put your hand on and feel going on and off.
As far as solenoids, you can buy them at a local auto parts supply. I would think they are intermittent. Sometimes by taking them in to supply house, there may be a number stamped on them. I do carry spares and the number for the solenoids is Prestolight SAE 4201 GC 12 volt. The main relay is Prestolight SBJ 4201 12 volt.
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