This is Maytag design. The drain pump is on the bottom right side in the rear. It incorporates a chopper assembly to grind food particles as it drains. Sometimes food or other items get caught in there causing a no drain condition. If it's the top drawer, its easy to access. Just start removing screws from the bottom panel to access it. If it's the bottom drawer, you'll need to disassemble the front panel and un-click it from the bottom rails so you can remove the drawer and place it on its side for service. Bring lots of towels and a wet/dry vac. And take your time.