Fill drain light would come on and the dishwasher would not drain. We have a large leak also. I knew 2 years ago I replaced the levelor and a sensor. That fixed the problem of the drain, however, we still have a large leak. I removed the bottom and propped the dishwasher up on blocks to see if I can tell where the leak is coming from. It appears to be in the back corner. I don't have a manual that gives schematics so I don't know what is located in that corner. Lillian