What is the legal test for a petition for a writ of administrative mandamus against an administrative agency's final decision imposing discipline upon a police officer?

An administrative agency's final decision imposing discipline upon a police officer is reviewable through a petition for a writ of administrative mandamus filed in the trial court. (See Code Civ. Proc., 1094.5; Wences v. City of Los Angeles (2009) 177 Cal.App.4th 305, 313 (Wences).) Since the imposition of discipline on city employees affects their fundamental rights, a trial court is required to exercise its independent judgment in reviewing the findings upon which the agency's decision to impose discipline is based. (Jackson v. City of Los Angeles (2003) 111 Cal.App.4th 899.)