I can only think of Swissair Flight 111. Still unknown. None the less if there was a major electrical short there is no fire agent that would help. Adding the fact that electronics require cooling via air flow there is no current logical answer other than the most sutable airport to land at. The only thing mechanially we can do is monitor current flow "we have circuit breakers".
I always thought it strange by Airbus to place the sniffer on the F/O side..
Hell, if it smells like !!!! it most likely is. Deal with the flight deck effect.