Good day,
It could be either the main heater, as you said or the defrost thermostat which is clipped to the top of the cooling coil.
You will need an ohm meter for testing.
Set the meter at RX1 remove the wires that connect the heater to the machine. With the ohm meter, use one end of the probe on one of the 2 heater leads. The other probe can be touched to the cooling coil, since it is grounded. You should read infinity. If you get any reading on the meter,replace the heater. It is necessary to perform the test on both heater leads, one at a time.
Do the same thing with the defrost thermostat. However, the thermostat can not be allowed to warm up since it will open it's circuit when it reaches somewhere around 50 degrees, and not reset until it goes back to 20 degrees.
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