The FRU (field replaceable unit) may be the entire lid or something else. This would need a Lenovo tech to assess what the repair needs.

2. yes.

3. A google tells me no. But as I've seen so many odd failures over the years from mostly drops I see this could indeed happen.

The problem with it being at 7 months is you must get it into the warranty repair since if you delay they won't cover it in the usual 1 year time frame and my bet is the repair may be half the price of a new laptop.