Big hot water cylinder, 3 immersion elements, failed thermostat?

Thanks for any replys. So big cylinder ,its all electric heating. The top element is working , theres power to the other two. Is there any check I can do, pressed "reset" to no effect.In fact there two stats per element, a control stat then reset stat. Could these be replaced with a nomal 11" resettable stat?

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edalerichard
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