88 560SEL Passenger Side Speakers

[pathogen]

Just picked up my 560SEL today.

I noticed that the passenger side speakers don't seem to be pumping out any sound at all. The forward, mid, and back speakers are all dead. On the driver side all the speakers work perfectly and sound great. I've tried adjusting the balance to only the passenger side but nothing comes out at all. I'm pretty sure that all three speakers aren't dead, so I'm hoping its a lose wire or something of the like.

Thanks for the help in advance.

-Pathogen