I don't understand what you say... but I'm on the same predicament; managed to test the continuity, resistance and the fact that the main defrost heater is actually heating... the large one, the coil one. Instead, the PLATE one doesn't not show continuity at the PCB connector, and upon close inspection can see how the ice is already accumulating and starting to clog the internal drainage hole. How to actually test the continuity or damage of the PLATE heater if that one doesn't have an evident internal connector?