Hi all, I have an e83 with the 'business cd' head unit. Lately there's a faint static sound that seems to be only on the left side channel (out of both speakers). It is most pronounced when the iPod connector is being used. I've jiggled the cable and cleaned the contacts on both sides. It doesn't seem to be related to the cable.

Also checked for water around the rear amp. Nothing there either.

Any other things I can check?

Thanks for any clues...