Issues after battery poles mixup - trunk switch faulty, no sound from speakers
 

Hey guys,

after my faux pas, where I misplaced the poles I had a lot of troubles. Car wouldn't start. After the service changed some fuses and reset the ECU it starts and works. Only two more issues:

1. No sound from the stock radio (non mark levinson, plain one). There are lights and CD changer plays, you can search for stations but no sound from speakers.

2. The trunk lever won't work. I can still open the trunk from the remote but the switch inside doesn't work.

Are there any fuses to check? I think I have exchanged all the blown ones but...