(a) The commission shall prepare a final investigative report including:
(1) the names of and dates of contacts with witnesses;
(2) a summary of correspondence and other contacts with the aggrieved person and the respondent showing the dates of the correspondence and contacts;
(3) a summary description of other pertinent records;
(4) a summary of witness statements; and
(5) answers to interrogatories.
(b) A final report under this section may be amended if additional evidence is discovered.