As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSP, IT WAS NOTICED THAT THERE WERE LOOSE/SMOKING RIVETS ON THE AFT PART OF THE CABIN DOOR AT THE HINGE LOCATION. THE HINGE WAS REMOVED AND THE DOOR WAS FOUND TO BE CRACKED ACROSS THE RIVET HOLES OF THE HINGE SUPPORT. THE CRACK STARTED AT THE AFT END OF THE SUPPORT AND MOVED FWD ABOUT 4 IN. THE SUPPORT WAS REPLACED AND THE ACFT RETURNED TO SERVICE.