No laws were broken. There is no way to levy a fine. The NTSB is not in the business of fining individuals or organizations for violating rules or laws. That's the job of the FAA and other various agencies that oversee road vehicles, trains, and boats.
The NTSB does their best to identify the probable cause(s) of the incident, what factors led up to that incident, and, most importantly, what measures to take to prevent any future incidents. It's up to agencies, like the FAA in this case, to implement suggestions from the NTSB.
In this case, most of the blame appears to fall on the FAA.