I have a 2006 Mazda6, V6. Lately there is some constant noise coming from inside the upper part of the B pillar next to the driver under the adjustable latch of the seatbelt. it buzzes softly but very bothersome when I travel on concrete highway. Can anyone have any idea what causes the noise and how to fix it? And how do you disassemble the cover of the B pillar to see the parts inside it?