Doing that won't likely get you anywhere, those voltages are close enough for things to be working.
If the thermistor was a problem, you would see large voltage drop across it after it was heated up, and sweep problems.
What you should see across it, is a large spike in voltage as it comes on when cold, that then lowers to a few volts when it warms.
If you really feel the need to try it out, try carefully jumping it after the set has been on for a little bit, but it's pretty much certain at this point, doing so will make no difference in the tuning problem that you have.
