<p>After a resin print completes, what is the expected process to finish the print? Is some cleaning expected? I also some manufacturers sell UV chambers to cure the print surface, is this required?</p>
<p>I purchased a low-cost printer from China that is quite high-quality hardware, but sadly short on documentation. Insight on the proper post-print process is appreciated.</p>

It is indeed possible that the thermistor is broken (yet not sure). I am aware of two types of issues with thermistors:
The contact (soldering) is broken, usually due to the temperature extreme variations. The thermistor will indicate the maximum temperature in case of PTC or minimum temperature in case of NTC. In some cases, due to vibrations or other factor, the contact will eventually touch, showing improbable jumps of temperature.
The thermistor is broken internally. In that case it will just indicate a wrong temperature. I can't say if constant temperature or constant delta.
For how to troubleshot the component, however, EE.SE seems more convenient.