You are not responding faithfully to the comment. A mechanic looking up the schematics in a manual understands them. Just because they haven't memorized the material does not make it the same. This is more analogous to looking up a function in the documentation that you forgot about.

This is clearly not what the post was referring to, which is instead like googling how to fix a pipe in your home when you've never done any plumbing before in your life. Can it work out? Sure, depends on the issue, can you cause your pipes to freeze, your house to flood, or sediment build up to completely block a pipe? Yes.