Music/Sound suddenly stopped working!

Hello everyone, my first message on here, sorry if there is an existing thread already dedicated to this.

I have a Jaguar XF R type 2020 and have had it for approximately a year. Out of the blue this week, the sound from the infotainment system has suddenly stopped. There is a clear connection and I can still connect Bluetooth etc but still no sound at all, radio, sat nav, voice control, sensor alarms, nothing at all.  Furthermore, the volume switch will not move from level 12.  I can still use the touchscreen/see the satnav but no sound at all.

I have checked fuses, connections, reset, reconnected devices, restored factory setting etc but still no sound. If anybody has any advice to try and resolve, it really would be appreciated. I maybe resigned to a diagnostic and hoping of course my amp hasn’t blown but wanted to check if anybody had other (cheaper) suggestions. Many thanks everyone!