Not feasible for me as my controller board's Ethernet interface is completely dead - so it's not even possible to get into it with the default IP address to configure anything let alone see the logs. 

Other people have comparatively minor issues and at least get some hashing out of their units.  Mine is completely dead in the water going on a week now, extending to at least another week.

I have 3 S1 units, and thought about swapping the controller from them, but they're still profitable and I don't want to muck anything up that is actually still running.

BITMAIN - PLEASE JUST SEND REPLACEMENT BOARDS TO THOSE WHO NEED THEM AND HAVE ESTABLISHED THAT IS THEIR PROBLEM.  WAITING 2+ WEEKS FOR A SOLUTION KILLS OUR PROFITABILITY.

But apparently the only thing that seems to matter to them is their own profitability.

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You could try the wifi.  If you place your S3s right next to your router,  your router should see them.