Join Date: Sep 2013
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Follow evilutions instructions for replacing the speakers (short of actually replacing them). Yes, you have to get at them from the outside, and it's a bit tricky, but doable without special tools. Don't cut the door liner - you can just pull it back from the corner to expose the wiring.
In defense of the smartcenter: intermittent problems are notoriously hard to diagnose. As the old saying goes "if it ain't broke, you can't fix it". I.e. unless the problem happens while the technician is looking at it, and stays long enough for him to follow basic troubleshooting, he'll never find the cause. And since troubleshooting involves taking the door apart, which will rattle the intermittent connection enough to make the problem go away, there is no chance for them to ever find it.
I didn't really find the cause of the problem either. Just did the soldering on suspicion, and a couple years of intermittance-free driving are the proof that it worked.