Whats the big deal with spurious fire warnings, the good old 61 and Pumas had them on a fairly regular basis, but it didn't make front page news in those days, think this was the main reason that cockpit mirrors were installed on both types.
Over the years I can recall several cases where different types had to fly back single engine, but no one outside of the company knew about it.
The problem we all have to deal with nowadays is that everything has to be reported, even a minor problem like one of your instuments fluctuating on start, will require an incident report, a few years ago the indicator would be replaced and away you go.
If false warnings are biggest problem on 92. it must be some machine.