Don't know for sure, haven't actually seen one of those models, but, I believe that you will find it under the refrigerator. Most models have the furnace under the refrigerator and there is more than enough space alongside of the furnace (it is long and skinny) to place the water pump. Look for a panel with a couple of screws holding it in place alongside the furnace under the refrigerator...
Again, that is only my guess; maybe someone that actually has that model will chime in
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