Leaks can occur on these machines for many different reasons. The most common though, is leaking due to damage to the door boot (or bellow as it is also commonly called.) It does not take much for a leak to develop. In this case the customer had shut the door with an item of clothing trapped between the door boot and the bottom of the door glass. When the unit went into its spin cycle, it pulled on the gasket hard enough to change the shape of the flap that seals to the bottom of the door. This unit was not leaking much – maybe a tablespoon per load, but it was definitely caused by this little wrinkle.
If yours is leaking and there are no obvious tears or holes in the door boot, then take a look at the bottom edge and see if it is a bit misshapen. If it is, a door boot replacement is what you’ll be doing to fix it.