2021 Pacifica hybrid stereo/amp issue
 

1. driver side speaker stopped working.
2. next day, the whole speaker system stopped working. If I increase the volume, static sound will increase and start to have periodic "du du du" sound every 3-4 second.
3. realized this sound is only coming out from the driver side speaker

Trouble shoot trials that did not work
1. soft restart pressing volume knob +/- tune knob.
2. taking out fuse from fuse box under hood and reinserting
- amp/ noise cancelling system
- uconnect display/usb s
- driver door mod
- DVD system etc
3. unconnecting square metal looking thing that was underneath driver seat (thought this was the amp) then reconnecting
4. took out the negative side from the battery
5. I attempted to see if I can take out the connection in the passenger side where the 110 V plug in is. but could not

question
Any other trouble shooting suggestion?

dealer shop is not available until 9/1/22. So just wondering.

Duk