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This is what I think it is also. Assuming that these are the same as normal electronics power resistors, they are possibly wirewound or filled with resistive material and then encased in ceramic. They can, and do, get really hot in operation and that's why they are made in ceramic. I'll bet getting hot and then exposed to instantly cooling water from rain eventually cracks them. If the cracks go deep, it is unlikely that the resistor is still in tolerance, and may possibly be open.
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