As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT WAS NOT GROUNDED. LEFT AFT SERVICE DOOR GUST LOCK PIN IS MISSING PIN TOP AND SPRING. DOOR WILL LOCK OPEN BUT IS MISSING ABOVE TO UNLOCK & CLOSE DOOR. REPLACED LEFT AFT ENTRY DOOR GUST LOCK PIN TOP IAW AMM 52-13-00. OPS CHECKS OK.