As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: GROUND CREW REPORTED LEFT AFT ENTRY DOOR WAS NOT CLOSED PROPERLY AND FOUND A PART WHICH FELL FROM THE DOOR. PART THAT FELL WAS THE AFT SERVICE DOOR GUSSET LOCK PIN AND SPRING ASSY. INSTALLED NEW LEFT AFT SERVICE DOOR GUSSET LOCK PIN ASSEMBLY PER AMM 52-13-21.