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The drain pump is on the base at the front. You will need to remove the top, console and front to get to it. There are many videos on youtube that show disassembly of these style washers if you need it.
There is a trap on the pump that is probably clogged, so you may not even need the pump. You can possibly reach and unscrew the trap by removing the door gasket retainer and pulling the gasket off - it all depends on how strong and flexible you are as there is not a lot of space. Tilt the washer back to the wall as any water in the washer pours out when the trap is removed.
I explained how to access the pump.