After an accident reportable under 49 CFR 195, a representative of the Commission may: Interview personnel; Examine equipment or pipe; Request issuance of a subpoena for production of equipment or pipe relating to the incident for independent preservation; Examine related documents; Order independent laboratory tests of equipment or pipe; or Take other investigative measures as needed to complete a comprehensive independent investigation. An operator shall preserve all equipment or pipe which may have contributed to an accident until the investigation by the Division is completed.