The model number and serial number are located on a sticker next to the left rear burner. The first 6 numbers of the serial number correspond to the month, day, year i.e. 02 31 05.

If your oven is before 02 02 05, the thermostat part # is PJ030003.

If your oven is after 02 02 05 the thermostat part # is PJ030031 which you can order from a parts dealer such as searspartsdirect.com

No tools needed here, just remove the burner grates to the left side and the cooking surface pulls up and toward you.