(a) The appointing authority may discharge an employee in the classified service, whenever he or she considers the good of the service and the welfare of the city will be best served thereby, by making and filing in his or her office an order to that effect together with the reasons assigned for the discharge, however, the power to discharge shall not be capriciously or arbitrarily exercised in any case; a copy of such order and the reasons assigned shall be served upon each the employee and the director before the effective date thereof; and a copy served upon the director shall be filed and retained in the office as a public record. The discharged employee, within 10 days after receipt of the discharge notice, may appeal the action of the appointing authority to the board, by filing a written answer to the chair with a demand for a hearing. It shall be the duty of the board to fix a time and place for hearing on the appeal, and to give notice thereof to the employee and the appointing authority, which appeal shall be heard by the board on a date not later than 30 days from the date the appeal is taken. The personnel board shall have the authority, after an appropriate hearing, and based upon a finding of the facts and applicable law involved, to reduce the severity of the disciplinary action taken by the appointing authority, and issue such orders and decrees with reference thereto as may be just and reasonable, and for the best interest of the city. The findings of fact by the board, based upon its records, and the testimony taken before it, shall be conclusive if supported by substantial evidence. If the appointing authority is sustained by the board, the discharge shall be final as of the date thereof; if the discharge is not sustained, the employee shall continue in the service of the city and shall be entitled to full compensation.

(b) A person in the classified service may also be removed or disciplined in the following manner: Charges may be filed with the director by any officer, citizen, or taxpayer of the city and the director, after an investigation, shall certify the charges filed, together with the results of his or her investigation, to the personnel board and the board shall set a day for a public hearing on such charges. The board shall on the date fixed receive testimony offered in support of and in denial of such charges and from such testimony make a finding of the facts and applicable law involved, in writing, and make such orders and decrees with reference thereto as may be just and reasonable and for the best interest of the city. The findings of fact by the board, based upon its records and the testimony taken before it, shall be conclusive if supported by substantial evidence.

(c) If a person in the classified service relies upon a direct order by a superior as a defense or excuse for the violation of this part or the rules and regulations adopted thereunder, or an omission to observe this part or rules and regulations adopted thereunder, he or she shall establish such direct order of a superior to the reasonable satisfaction of the board.