This might sound silly, but has it defrosted? If its working properly there shouldnt be any water anywhere, just ice - my old one used to defrost on its own if it wanted to so it may be that - just a suggestion ;-)
On my fridge/freezer there is a drain that runs from inside at the baclk of the fridge compartment that runs to the outside at the back for the water that collects to evaporate off - maybe there is a pipe that has got mis-routed.