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Apple Service Diagnostics - Theta dh Too High

I recently ran ASD on a MacBook Pro (15 Inch, Mid 2012). There was only a single error: "Theta dh Too High". I've researched this issue online, but I've been unable to find any information on it. The machine seems to be functioning normally apart from this single error.
2 Solutions
I think that means that something is overheating. Perhaps an improperly attached heatsink.
Dr. KlahnPrincipal Software EngineerCommented:
According to Apple docs, "theta dh" relates to CPU temperature.

Apple theta dh
(Why not "CPU temp", one wonders.   The same number of characters and immediately understandable.)
You have closed the question,
Also consider moisture as a possible cause.
Have any liquids been spilled on the MacBook?
Look for corroded or short circuited parts on the logic board.
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