The 9V Battery Snap Connector is connected to motherboard via 2 wires: 1 red and 1 black.

The red wire is soldered to the left of the DC Adapter Port, and the black wire is soldered just below the single 1/4 inch line input jack.

To replace the 9V Battery Snap Connector, simply re-solder the connection in the back of the motherboard at these two points.