You hit upon my very favorite thing about Thinkpads: they are user-repairable and user-upgradeable!
Lenovo has the most amazing website that tells you, step-by-step, how to fix almost every component of their products. For those that are considering one of their products, you have to check this out: https://www.lenovoservicetraining.com
I've made a hobby out of finding, refurbishing, and reselling Thinkpads since the late 90s. The Ts and Xs have maintained a reputation for serviceability across years.
Lenovo has the most amazing website that tells you, step-by-step, how to fix almost every component of their products. For those that are considering one of their products, you have to check this out: https://www.lenovoservicetraining.com