On second inspection there was no corrosion but it seemed like at the contact points there was a little bit of black discoloring on the contacts, probably some minor oxidation of the nickle plating. so i used a diamond file and dab of D100 to the contact points and the error message hasn't returned
The problem started two weeks after removing and reinstalling the bulbs for some work I was doing replacing the rear boot lid open button called the rear grip strip.