Every button in HCU is functioning except the manual button. Currently, we are working around this issue by assigning another button as the manual button. Despite attempting to reset the joystick to its default settings, the manual button remains unresponsive.
To fix the issue we just disconnected the connectors of manual buttons, then check the continuity with a multimeter, the connectors seems to be fine so we reconnected and the manual button starts to work perfectly.