For the last few months the CHT on both sensors has been increasing.  I took it to an A&P, had the oil changed and the radiator cleaned.  The problem however continues to get worse.  My last two attempts at flying having been the same, manifold pressure goes higher than it should below 5,000 rpm but then stops being a problem.  The CHT will get into the 270s with an OAT of 66F.  I have checked all the coolant and it is where it should be, my A&P suspects it is the CHT sensors but I don't want to find out while flying to him if this is actually the case.  Any help or insight will be greatly appreciated.  Thank you.

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