Turned out to be an Air Bag gone bad. They diagnosed the buzzing to the blower motor in the ventalation system. Not so sure about that diagnosis, as the two seemed related. Could have been a coincidence.

They tightened up everything in both doors and put off the door lock actuator saying they didn't hear it. Ugh! What do I have to do....set up my camcorder??

Feeling damn glad I went ahead and bought the extended warranty after all.