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.
UPDATE:
I told Microsoft that I'm not satisfied paying $1,000 for another Surface Book and the support agent I was speaking to said he would pass my case along to someone higher up to see about another solution.
Well, almost a month later I get an email from Microsoft Support. This time, they've offered me a Surface Pro 4 for $600 CAD. They want me to pay $600 to downgrade my laptop.
At this point it's almost like they're trying to add insult to injury. I'm so frustrated.