Yeah, if it's only heat related as in problem happens at one temp vs doesn't happen at another and not heat related as in does this sorta at one temp and worse at another temp, I'm standing by my thoughts that it's electrical and not mechanical.
No idea why you don't have codes, but start heating/cooling parts as oldguyDave has mentioned and see what happens.
You work at a shop, pick your coworkers brains.
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