Can you get to the condensate drain pan, if so check the water level, there shouldn't be much in there if everything is working right. One of the units in one of my stores had the evaporator freezing up and when it started to melt resulted in water in the ducts. Not saying that's your issue but the drain pan was out of line causing water to run down, ended up putting a piece of sheet metal to deflect the water back in to the pan