Well, I'm having the same issue. My screen is yellowing and the battery is causing the display to bulge making this "premium Microsoft product" unsafe and unusable.
I contacted Microsoft support who let me know I'm outside the extended warranty period. Which was graciously extended because they know there's a defect with these.
Support offered me a same generation, refurbished model for CAD $1,000. So, another $1,000 for another Surface Book that will eventually have the same problem.
This issue absolutely needs legal action.