49 CFR §39.103

1. (a)If the complaint is made to a CRO before the action or proposed action of PVO personnel has resulted in a violation of a provision of this Part, the CRO must take, or direct other PVO personnel to take, whatever action is necessary to ensure compliance with this Part.
2. (b)If an alleged violation of a provision of this Part has already occurred, and the CRO agrees that a violation has occurred, the CRO must provide to the complainant a written statement setting forth a summary of the facts and what steps, if any, the PVO proposes to take in response to the violation.
3. (c)If the CRO determines that the PVO's action does not violate a provision of this Part, the CRO must provide to the complainant a written statement including a summary of the facts and the reasons, under this Part, for the determination.
4. (d)The statements required to be provided under this section must inform the complainant of his or her right to complain to the Department of Transportation and/or Department of Justice. The CRO must provide the statement in person to the complainant in person if possible; otherwise, it must be transmitted to the complainant within 10 calendar days of the complaint.