What was found
LEFT AFT NR 4 ENTRY PASS/CREW DOOR CAME OPEN IN FLIGHT. FOUND THAT THE LEFT AFT NR 4 PASS/CREW SERVICE DOOR -RED- EMERGENCY HANDLE WAS PULLED PRIOR TO DEPARTURE. SUSPECT HUB PERSONNEL LIFTED HANDLE TO RAISE DOOR WITH NO RESULTS, THEN RELEASED HANDLE WITH NO COCKPIT DOOR WARNING INDICATION. DUPLICATED THIS SCENERIO WHEN THE AIRCRAFT RETURNED TO GATE AFTER TRANSLOAD. CLOSED, LOCKED, AND SECURED DOOR PER DC-10-30 M/M CHPT 52-12-00-0. A/C OK FOR SERVICE.