Washing machine drain pump. On some models you will need to configure the replacement pump to match the old pumps outlet port direction and reuse the old mounting bracket. If the washer does not drain then the drain pump may be clogged, damaged, or defective.
Washing machine door bellows. If the washer is leaking, the door boot may have a tear in it. Overloading the washer is the most common cause for a torn door boot.