Comment Dead "B" key (Score 1) 212
tl;wr: 1 bad sensor on the B key of 17 month old laptop, costs $795 to repair - 1/3rd the cost of my barely older than 1 year laptop.
On my 2016 15" TouchBar MBP, 17 months after purchase, the "B" key suddenly started sporadically inputting 2 B's for every press. It would even input the B's interleaved with other letters if I was typing quick enough (this is a babd problem).
Took it to the GeniusBar where they ran some diagnostics, then informed me (since I was 5 months out of warranty) I needed to pay $795 to fix the one bad sensor. To do so they have to replace: the entire top deck, the touch bar, the keyboard, touchpad and battery. The tech said he had seen the issue a number of times, but that those other laptops were in the warranty period, and that I should have bought AppleCare.