A service appointment is not necessary. This could be done the next time you fuel or at another convenient time for you. From the back of the maintenance facility, go to door C2 and honk. If the doors are open (the numbers won't be visible) then go to the 1st door past the dumpster and pull in. A technician will replace the needed item. If no one responds to the honking, please come in to locate a technician.