Identified unit that is having water issues. Mitch informed me that he had cleaned out drain line and drain pan before my arrival. Tested system. System functions as designed. Refrigerant pressures and temperatures are appropriate for indoor and outdoor conditions. Saturation temp on indoor coil 45*. System is not freezing. System is draining properly, could identify no leaks in drain pan with water level in drain pan appropriate. Appears water was spilling out of drain pan into return duct when drain was clogged. Left system off, recommend leaving system off until the rain passes this week. If ducts remain dry, no leaks at roof or roof penetration of equipment. Then turn system back on.