My 2003 Murano reached 7,500 miles and the dashboard maintenance alert display which was set by the dealer went off. I tried to reset it using the instructions in the owners manual. It would not allow me to set the mileage over 7,500 miles. Is this something they built into the car so you have to have the dealer reset it?? Does anyone know how to reset this so I can set it myself?? Any help would be appreciated. Thanks