You cant reset it without having the problems checked, the light is just going to come on again. once they are fixed it can be reset with the help of the scanner Jamal is talking about. Everything for the guys at Gargash to take care of ...
My experience tells me that it could be a problem with the stop lamp switch not sending a signal to the gearshift module although usually when this fails the lever does not shift out of P at all. Worth a try.