You are going to have to open it up and check the wiring that goes to the door light and thermal fuse/thermostat devices. You my just have a loose connection which is causing the problem, and if that loose connection is in the circuit that goes to the thermostat it can cause the dryer not to heat.
Inside the console you should find a wiring diagram which will help you trace the circuits you need to check.
If that does not work, check the thermostats for continuity.
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