Gas dryer repair

I have a gas dryer that heats up for the first 10 minutes and then stops heating, The drum still turns. I have done some research and cannot decide if it is a thermostat problem or a coil problem. After looking at the diagram for this model I don’t even see a coil or heating element. I would appreciate any information you can give me. Thanks

the coil assembly is #1 in diagram ,under base heater motor, part#is ap4047607, under appliance parts pro number