Why? They fixed it.
replyIn a month is why. It seems if it was fixed that fast it was easy to find. If it was so easy to find, why was it not found. These are the types of questions that seem to make NASA push things further than just a month. So again, it seems fast to me
replyIt feels fast to you because you don't know what happened, and you are asking questions that have been answered by NASA already in public.
replyIt was easy to find because they knew what valve was leaking.
It was not found beforehand because they don't have the ability to do the tanking test without rolling it to the launch pad and its very hard to know how a system responds to liquid hydrogen.