Hi. When I engage sport mode the exhaust note does not work, the sport mode engages normally. However, there is no change in the exhaust note. Anyone experienced a failure in the system before? I found a similar issue for a diesel qp here https://www.ghibliforum.com/threads/no-active-exhaust-note-in-sport-mode.36897/ which hints on a speaker failure in the backbox but he doesn't report the outcome. Can anyone suggest where to start looking? Maybe fuses or electrical first? My car is a 2014 Ghibli diesel. Thanks in advance for any help.