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What kind of software or hardware do you use for "troubleshooting NMEA issues"?
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There are only a few problems you might have to deal with. Testing the continuity of the 3 wires you might have running around and a failed serial port on the receiving or sending end. For the most part the real world says it works or it does not if it ever worked at all. If you consider most NMEA devices have embedded serial ports I doubt you could repair one in the field. If you don't know how to connect devices then that information would of course be useful. If the wiring is properly set up there isn't much that can go wrong.
Making a test setup with a short cable that you know works would be the best way to test devices.
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My Brookhouse multiplexer has a USB output, so I run that to my laptop. The laptop recognizes the multiplexer as a COM (serial) port, running at 9600bps, so I just use Hyperterminal (included with Windows) to view the incoming data stream.
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That's not a bad idea but if you can read the data then it's more likely the case that you don't have a problem to troubleshoot. You also don't need a multiplexer to do it. If you are multiplexing more than one source then you would want to isolate them one at a time to see which device was faulty or see if it was the multiplexer itself that was the problem.