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Re:Don’t buy the MacBook Pros even on sale, in my opinion by shabble on Wednesday April 25, 2018 @12:41PM (#16923321)
If it's just a keycap (and maybe even the butterfly mechanism) that shouldn't be too bad.

https://www.youtube.com/watch?v=4KuVvb9DTaU (from about 5:20) talks a bit about what's involved in an actual keyboard replacement, if you ignore some of the histrionics.

I think from what I've heard that for actual replacements, Apple will swap out the whole 'top case' subassembly, which could be a 4-500$ part if it's not covered under warranty.

Re:Don’t buy the MacBook Pros even on sale, in my opinion by cjarrett on Wednesday April 25, 2018 @12:44PM (#16923357)
That is what happened to me. The entire top case had to be replaced. Luckily under warranty, however.