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I am assuming leaking when it is running, not sitting idle. Leaking from the door? Fill and run unit for 1 minute with no detergent. Open door. Are suds present? Suds turn into water when they drop to the floor. Suds can flow over the lip of the tub and drip to the floor. Oversudsing, Sometimes old detergent breakdown. Rinse aid dispenser leaking will cause oversudsing. Combination of all in one products will cause many problems. If suds are present after running unit a minute, pour a cup of cooking oil in unit. Run and fill it a few times until suds are gone. Possible most common cause is dispenser latch grommet.
Remove the front kick panel to see if the water is draining from the front of the machine. If not, look under the machine while it is running with a flashlight following the large black rubber hose to the center of the machine. If it is dripping there, you have a leaking water pump gasket/hose or bearing seal. Some pumps aren't always located in the center. If it is only on the drain cycle, then it is most likely a pump or drain hose. Also bear in mind that some Dishwashers connected to a garbage disposal can leak over time due to the vibrations caused by the disposal and a brittle drain hose.
I've got a 4306, and while it never leaked, the bottom door gasket did seem to chemically melt over the years.
I replaced it a few months ago. I don't know that a steam vent is needed as the gasketing system never allows any steam pressure to build. And, if anything, in general, the gaskets are in worse shape now than when the dishwasher was new, so leakage due to steam pressure would have been greater when new.
I have seen this on my unit. There was water in the drip pan under the dishwasher. Water in the drip pan comes from a leak. In my case, the water valve was getting so old that it was letting too much water into the unit when it was trying to fill. This cause the filling station to over flow into the drip pan. A quick fix - I removed the water from the drip pan under the unit and I was able to turn down on the supply valve in the basement to limit how much water could come in. This allowed the unit to run without overflowing. I will replace the water valve soon.
Other possibilities, the float device used to detect too much water in the drip pan or too much water in the unit is stuck in the too full position. Or the pump out pump is stuck and not moving water.
It sounds like broken glass shards have become lodged in the pump. You are looking at the possible need to replace the pump, and locating and repairing those leaks.
The cost of parts alone could exceed 200 dollars.
With a 12 year old unit, you may want to consider just replacing it, especially if you would need to pay a repairman to make the repairs. Your cost of repairs may actually exceed the cost of replacement.
At this point, the unit is already broken, so it couldn't hurt to remove the unit, disassemble the pump and look for the damage yourself. You may get lucky and just have a few seals to replace and a hose or two.
Here is a picture of a water pump, your should be similar and located underneath the bottom of the unit.
There is a ventilator mechanism on the top right corner, behind the control panel / front cover. ******TURN THE POWER OFF AT THE BREAKER BEFORE STARTING, BE SURE POWER IS OFF ****** Open the door; remove all of the screws that hold just the front panel (not the controls panel). These screws are located on the inside of the door, around the outer edges. The front door panel will be able to be removed. Close the door with the front panel removed. ***IMPORTANT be sure nobody will come in contact with the exposed wiring (especially little kids) ********* Turn back on the breaker, turn on the washer, and run a quick rinse cycle. See where the water is coming from. On my washer (same model) i had to replace the entire vent kit (sears parts ~$40.00) Call them with your model and serial number, or search online. Removal and replacement was very easy, and it did fix my leaking problem. Checked with the front door panel off and a quick rinse before I TURNED POWER BACK OFF and put the front cover back on. Root cause?? From what I can tell, the solenoid stopper hardens over time, which allows for water from the spray arms to leak past. Get it fixed now before you smoke the motor or control card. My part number was ABT35083501 be sure to double check model before purchasing.