Turn off the water to the icemaker/dispenser. It is more likely a leak than condensation. Unplug the fridge.There should be one or two screws mounting the valve to the back of the fridge, by taking them out you will have better access to the water tubing. These are simple slip connection fittings and if you press the plastic ring up into the valve it will allow you to remove the tubing with a simple pull. You can then clean and inspect the tubing and valve for grooves, scratches, cracks or an uneven cut that would allow the leak. If you have to trim the tube use a new blade in a utility knife and cut straight on a hard surface. Put it all back together and put a dry paper towel between the valve and the wires to make it easy to check for leaks. Make sure someone operates the dispenser while you are checking as some of the connections are only under pressure when water is called for. You may have to wait for the ice maker to cycle to check that connection, or when you plug it back in press the paddle that checks for ice in 3 times and it will force a cycle, just make sure it has ice in it and not water or it will overflow.