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The heaters are made of concentric heating coils in kind of a square shape. A defective heater would be missing power to one or more of those coils. There is no cicil mdatly over the area where the wires and thermistor enter the bed. If theabed isn't heating atll, it ccoould bearak in the main wires, or a fault with the Rambo board
Check the heater with an ohm meter, it should read around 2.4 ohms. If it is drastically different then I would suspect it is bad. Make sure you check it when the bed is unplugged.