Any interested party may file a complaint with the Administrator alleging a violation or violations of terms of an agreement entered into pursuant to § 605.14 . A complaint must be in writing, must specify in detail the action claimed to violate the agreement, and must be accompanied by evidence sufficient to enable the Administrator to make a preliminary determination as to whether probable cause exists to believe that a violation of the agreement has taken place.
49 C.F.R. §605.30