How do I repair/replace GPS?

@halpme85 it is not user serviceable. Yes, you can replace it if you know how to perform board level soldering and have the tools as well as some magnifying source etc. It is an IC that is soldered onto the motherboard. There may be other parts that are responsible for the GPS not to work. Check your antennas first. Those are more likely to fail.

I suggest you follow the Samsung flowchart.

Use this document GPS Motherboard and the search function of your PDF reader to locate the components to check