Hi @redjay ,
After 6+ years and if you don’t know what kind of life it had and in what environment it was kept it may be worthwhile to open it up and clean the fan and clean off and replenish the thermal paste on the CPU. This action may keep it going for much longer, with less problems than if you didn’t.
Here’s a link to the [https://thinkpads.com/support/hmm/hmm_pdf/x230t_x230it_hmm_en_0b48730_02.pdf|service manual] for the tablet.
Scroll to p.89 to view the necessary pre-requisite steps and then the procedure to remove/replace the thermal fan assembly. It also shows how to re-apply a new coat of thermal paste on p.92.