I love the Lensrentals teardowns! I just finished reading this teardown of a then-flagship Sony camera that was exposed to saltwater.
https://www.lensrentals.com/blog/2017/10/about-getting-your-...
Or if you're a Nikon fan, here's their teardown of a Nikon flagship a year later. Note that this camera wasn't suspected of exposure or abuse, so not really a comparison but I'm fascinated by how modern pro cameras are built, their weaknesses, and how they may or may not be serviceable.
https://www.lensrentals.com/blog/2018/10/teardown-of-the-nik...