The panel is displaying a MUX CPU FAIL. Is the panel or MUX Driver Card bad?
If the panel is wired Class A on the Multiplex Buss Check the Buss for a short - A short, ground or noise on the Class A loop will cause a CPU FAIL to be displayed on the Panel.
If there is not a short, ground or noise on the mux loop or the panel is wired Class B then do the following:
Part numbers FPD-7024, D7024, DS9400, DS9400I, DS9400M, DS9431, D7039, FPE-7039