As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: L2 DOOR AFT ENTRY LIGHT CAME ON IN FLIGHT. DOOR HANDLE MOVEMENT WITH LIGHT INDICATION AND WOULD NOT REMAIN CLOSED. AIRCRAFT RETURNED TO CMH AND LANDED WITHOUT INCIDENT. MAINTENANCE PERFORMED L2 DOOR, DOOR STOP ADJUSTMENT IAW AMM 52-13-00-820-801 STEP Q "STOP PIN ADJUSTMENT".