Car went in for its service the other day. Maserati have released an update for the instrument cluster that cures both the spurious engine warning light and power steering errors. Apparently it's purely a software issue. Dealers are doing the update as cars come in rather than recalling them for it.
Also, have to say, not sure what's spurred this on but I'm quite smitten with the car at the moment. Thinking I'm learning to be less critical about its flaws.