As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN REPORTED THAT AFTER TAKE OFF AFT STAIRWAY DOOR LIGHT TURN ON. DURING REVISION LEFT HOOK WAS DETECTED NOT SECURED AT AFT STAIRWAY DOOR. REPORT WAS DEFERRED IAW MEL 52-3, CAT D. AFTER, DURING PUSH BACK AT MEX THE AFT STAIRWAY DOOR LIGHT TURN ON. IT WAS NECESSARY TO VERIFY THROUGH TAIL CONE THAT THE STAIRWAY WAS CLOSED AND SECURED AND THE LIGHT TURN OFF IAW MM 52-70-00.