This part applies to demands and requests to current and former employees, advisors, and consultants for factual or expert testimony relating to official information or official duties or for production of official records or information, in legal proceedings in which the MSPB is not a named party. This part does not apply to:

(a) Demands upon or requests for an MSPB employee to testify as to facts or events that are unrelated to his or her official duties or that are unrelated to the functions of the MSPB;

(b) Demands upon or requests for a former MSPB employee to testify as to matters in which the former employee was not directly or materially involved while at the MSPB;

(c) Requests for the release of records under the Freedom of Information Act, 5 U.S.C. 552,or,5.S.C. 552a; or

(d) Congressional demands and requests for testimony, records or information.