Seconded.....Maybe a bridge rectifier?
I'm sure you meant a NTC. A PTC increases its resistance with rising temperature.If you used a hair dryer to heat the rectifier, there is a chance you heated the PTC thermistor (grey round object on the left of the pict). They are used as to limit surge current. It to may be faulty as the resistance is suposed to drop as its heated.
by Jake Hertz
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