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NTC's (Negative Temperature Coefficient) are inside the case, clipped to pipes. Not expensive in the scheme of things. They are dry fitment, and measurable with resistance, and the 'negative' bit means the resistance goes down as temp goes up. But i'm not recommending you go inside the case...

(Just read the post properly..after 5 pints Parvha and dont have answer, but unlikely to be PCB)