Ah, now I see.
"bridgeSound": {
"LiftDoor": {"volume": 1.0,"file": "sfx/dbridge/dbdoor.wav", "group": "BridgeGeneric"},
"AmbBridge": {"volume": 0.3,"file": "sfx/dbridge/dbamb.wav", "group": "BridgeGeneric"},
"RedAlertSound": {"volume": 1.0,"file": "sfx/dbridge/dbklaxton.wav", "group": "BridgeGeneric"},
"GreenAlertSound": {"volume": 1.0,"file": "sfx/dbridge/dbgreen.wav", "group": "BridgeGeneric"},
"ViewOn": {"volume": 1.0,"file": "sfx/dbridge/dbviewscreenon.wav", "group": "BridgeGeneric"},
"ViewOff": {"volume": 1.0,"file": "sfx/dbridge/dbviewscreenoff.wav", "group": "BridgeGeneric"}
},
The first value (ex, "LiftDoor") is the one being changed to the file specified (ex, "sfx/dbridge/dbdoor.wav")