Ok sounds to me like there is a leak on maybe the valve or the pump, best thing to do is to grab a putty knife, slide it in between the front panel and the top panel about 3 inches from each end.
Push the clip holding the front panel in place, you should be able to pull the front panel off. Next grab a flash light and check to see where the water is coming from, you may need to turn the water back on. If from the back (the valve) if from the front it could be the pump.
Unfortunately I cant just say it's coming from "here" you would need to take a look and trace the source.
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