It’s another CPU temp sensor apparently.
As for why, I would guess you need to go around the heatsink screws a few more times. Also what are the fans doing in terms of duty cycle? Use framework_tool to force them to 100% and try again.
On the working assumption that you fully cleaned out the hair from the fan blades and heat exchange fins, the heat is either not leaving the CPU fast enough or not leaving the heat vapor chambers fast enough. I found I had to go around the heat sink more times than I would have assumed to get a constant clamp across all of the screws, and that would explain why you have ok-but-not-great heat transfer.
Arcadiy_Ivanov1
Conor
I also could not find any documentation officially saying those temps are a problem, but they certainly are for some DIMM configurations/manufacturers. I can personally confirm that I had problems when they were getting that hot until I used thermal transfer pads as well.