Or forward bilge pump. There's a separate bilge under the mid-cabin, not connected to the engine room bilge. It has its own pump. Could some soap or other cleaning product been spilled into the bilge?
@LaRea is correct, one is the mid-cabin bilge pump and one is the shower sump. Check under the aft cabin couch, remove the floor flange and look inside to check bilge pump. Then, under the port side couch cushion there is the shower sump, that needs to be cleaned once in a while depending on use.
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