(a) Each appointing power shall establish in writing its own internal discrimination complaint process through which a complainant may obtain review of, and a written response to, an allegation of discrimination, harassment, or retaliation based on a medical condition or mental or physical disability, or denial of reasonable accommodation for a known physical or mental disability.

(b) Each complaint filed with the appointing power shall be in writing and shall state the facts upon which the complaint is based, and the relief requested, in sufficient detail for the appointing power to understand the nature of the complaint and to determine the individuals involved. The complained of act, omission, event, decision, condition, or policy must have occurred no more than one year prior to the date that the complaint is filed with the appointing power. This period may be extended by not more than 90 days in those cases where the complainant first obtained knowledge of the facts of the alleged discrimination more than one year from the date of its occurrence.