Nope :c The IntelXTU is not working to do this, it seems to be locked or something. And I've already replaced the thermal paste and cleaned everything inside. But temperatures are exactly as high as they were before the cleaning.Might be worth some disassembly, new thermal paste & dust removal before you go that route. Especially if this is a fairly new occurrence and it was ok before.
I believe IntelXTU can be used to undervolt though, if you decide to go that route:
https://www.notebookcheck.net/Intel-Extreme-Tuning-Utility-XTU-Undervolting-Guide.272120.0.html