I found a bolt inside the door of my 1995 C280. It appears to be a bolt for the door check (washer head, painted body color). However, both bolts on the front of the door are in place and appear to be original. I looked for anything missing and didn't find anything so I closed it all up. I still have a nagging feeling that I overlooked something (maybe the hole is under a wiring harness or something). Is there a third bolt holding the door check on this chassis? I know some of the older cars had a third bolt supporting the rear of the check.