A preliminary review supported the agency's conclusion Wednesday that the outage was due to a damaged database file; the question now being explored is how the file was damaged.
The review blamed employees who didn't follow the proper procedures.
https://www.washingtonexaminer.com/policy/technology/faa-personnel-incompetence
It was the janitor, he unplugged the Commodore Vic-20 running it to plug in his floor buffer, and that was the cause. The janitor as since been fired, so no more need to investigate. No, it was a fucking cyberattack, and they're not going to say it.