Hi, I moved into a house with a Tappan free standing gas range. The model number has been obliterated by years of washing grease out of the top burner area. The only number remaining is the serial number "NF54410494". This unit is about 5 years old, from what I've been told. Is there any way to get a model number from the serial number? I need to have a manual to order replacement parts, when and if they ever do break down. Thanks, Bill Becker