2006 BMW X5 E53 (MarkIV Nav, CD stacker that will allow MP3 with ID3 tagging)

After suffering a flat battery post a firmware update and playing with the Nav system too long with doors open and interior lights on.

"Updated to Nav_SW.v32 (4-1/100) from 4-1/80"

I slow charged the battery and took the 2006 X5 E53 3.0 Diesel for a good long drive to reset the fuel computers, i have noticed the Speakers on the left side of the vehicle no longer work?

After reading i find it common to have a problem with the Radio Module adjacent to the battery.
Considering i removed and refitted the spare wheel yesterday, i thought perhaps i just knocked some wiring about, a plug perhaps.

Today i once again removed the spare wheel and visually checked all wiring and plugs. At this point, i am not under the black plastic cover that houses the TV, Radio Module and GPS, just what you can see at the Spare wheel itself.

Trying the stereo again, i now have the rear left speaker working, but not the front. No matter what the "Balance" or Fadar" are set on.

While listening to the Left/Rear speaker by itself (Balance set 100% to the left), i notice it fades away, then comes back and can even stop altogether.

Turning the ignition off then back to position 1 will once again get this left/rear speaker working.... yet no left/front.

I have read similar posts elsewhere and the problem seems to be pointed at the Radio Module most times....
With either Repair or Replacement being suggested.

1. Was it the flat battery?
2. The charging process?
3. Pulling the spare wheel in and out?
4. Software update to 4-1/100?
5. Loose connection in doors to speaker?

Any ideas?

I found another post here that was somewhat helpful: http://www.xoutpost.com/bmw-sav-foru...hat-could.html

I have posted the same question on another popular BMW forum