Is there a way to troubleshoot the thermal issues without parts?

I have a Lenovo T420 and the thermals of the computer are not exactly accurate. I am wondering if I can try anything before I buy new parts, since I'm closer to comfort then I want to be with the expected part costs to repair the entire system as it is. It would be nice if I could recalibrate the tempreature sensors and seeing what that does, but I can't find a clear way to do it.

As of now, I have tried the following fixes:

• Heatsink removal (dusting purposes)
• New TIM (Artic MX-4)

Neither of these fixed it, so I took the keyboard off to get an average on how hot the heatsink measures vs. what the computer reports, and this is why the readout is highly suspect.

Before I mention the readout from the measurements I took without the keyboard, this is what I get with Aida64:

As far as measurements from the heatsink itself, this is what I get with an IR thermometer:

• Vent: 57.6-67.8c
• Rear vent: 60c
• CPU plate: 61.2-66.6c
• Heatpipe: 35.2-52.4c

I have also measured it with a thermalcouple and did some datalogging from my multimeter, and this is what I got:

CPU plate:

• 32-53c

Heatpipe area 1:

• 42-49c

Heatpipe area 2 (opposite side measurement)

• 42-48c

CPU vent:

• 52-55c