while driving to NorCal, I heard additional squeaking noise from the center mirror/front camera area and noticed debris as well. So, after returning, I carefully removed the mirror centerpiece by wedging an expired credit card, plus the housing cover for the camera. applied some felt tape on the trim pieces. took for a test drive, viola! The noises are gone! (hope doesn't come back!!). the debris fell out as I removed the camera housing. hope this help other to isolate noises in the cabin. Till the next adventure!!!