had a strange rattle? for a couple of days, seemed like it was in the font passenger side, raked all over for the cause with no joy, then today something caught my eye as I trundled through a left/right in town, a 501 bulb had dropped out in the courtesy light love the mirror and rolling around in the housing. A quick stop and bingo, noise gone, hadn't noticed that a light wasn't operating but you see the light so much during the day, I like a simple fix.