I removed a lower rear cover panel to expose the workings of the water supply area and checked all line fittings to confirm that they were tight then I determined that the secondary water valve was leaking when activated. These electromagnet valves open each time that the water or ice dispensers or the ice maker functions are activated and they can fail after several years of constant use. My refrigerator is 15 years old and I was concerned that the replacement part would be difficult to locate; however, the ApplianceParts.com website helped me quickly pinpoint the replacement valve and confirmed that it was appropriate for my refrigerator model. The part was delivered in two working days.