kstrahan, to rule out that it is water being siphoned back, disconnect your water supply lines and see if water gets siphoned back into it as evidenced by water in the tub. If there is no water in the tub, it is not the drain that is at fault. There are a few things I would be checking on. first one are the water inlet valves. It is easily possible that one of them, or both, have failed and let water leak into the machine. Disconnect one hose and check for leaking water, then the other one. This will tell you if and which inlet valve has failed. Check this video on how to replace the inlet valve. the part is available at places like this. I would also check the solenoid of the valves with a multimeter, testpoint image is attached. For further information, download the service manual from here Hope this helps, good luck.