The cooling fins inside the refrigerator at the top defrost periodically. This water is collected in a tray below the fins. Check to see if this tray is full of water.
The tray is supposed to drain down a hose that ends in behind the outside service door. Some drains extend outside, and some drain into another tray near the heater stack where the water evaporates. There is a plug with a small orifice at the end of the drain hose. The orifice can easily become clogged. If there is water in the tray inside the fridge, pull the plug out of the end of the drain hose (watch out for the water that will come out) and clean the orifice.
The other possibility is a leaking icemaker water line or solenoid. The water line before the solenoid and the solenoid can possibly be repaired from outside, but if you need to replace the plastic line from the solenoid to the icemaker, you will probably havee to pull the fridge out.
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