This back cover is held on by tabs. If you lever them around the edges the black back cover will come off. Remove the control knobs Remove the 2 screws holding the copper retaining brackets and prise the front off levering the tabs Remove the Torx screws from the back of the circuit board. The circuit is now free to change the LEDs LEDs & ToolsTools RequiredTorx T9, T7LEDs42 No 0805