; (2) has given or is about to give, any information in connection with any inquiry or proceeding relating to any right provided under this Act; or (3) has testified, or is about to testify, in any inquiry or proceeding relating to any right provided under this Act. 6. Remedies and enforcement (a) Investigative authority (1) In general To ensure compliance with this Act, or any regulation or order issued under this Act, the Secretary shall have, subject to paragraph (3), the investigative authority provided under section 11(a) of the Fair Labor Standards Act of 1938 ( 29 U.S.C. 211(a) ). (2) Obligation to keep and preserve records Each employer shall make, keep, and preserve records pertaining to compliance with this Act in accordance with regulations issued by the Secretary under section 8. (3) Required submissions generally limited to an annual basis The Secretary shall not under the authority of this subsection require any employer to submit to the Secretary any books or records more than once during any 12-month period, unless the Secretary has reasonable cause to believe there may exist a violation of this Act or any regulation or order issued pursuant to this Act, or is investigating a charge pursuant to subsection (c). (4) Subpoena powers For the purposes of any investigation provided for in this section, the Secretary shall have the subpoena authority provided for under section 9 of the Fair Labor Standards Act of 1938 ( 29 U.S.C. 209 ). (b) Civil action by employees (1) Liability Any employer who violates section 5(a) (with respect to a right set forth in subsection (a), (b), or (c)(3) of section 4) or subsection (b) or (c) of section 5 (referred to in this section as a covered provision ) shall be liable to any employee affected for— (A) damages equal to the amount of— (i) any wages, salary, employment benefits (as defined in section 101 of the Family and Medical Leave Act of 1993 ( 29 U.S.C. 2611 )), or other compensation denied, lost, or owed to such employee by reason of the violation