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Hi my name is Robert...
I would try and run the pump and then go outside to the plumbing bay where the hook up is for city water and listen for the pump, many times it is mounted to the wall or you will have a panel in the plumbing bay to access the pump. Sometimes they can also be inside, under the bed or under the sink the bottom panel will come off. You should be able to hear the pump and go to that location and look for a false panel or drawer to get at it. IF you still need help please let me know as other experts might be able to help out on this.... Robert