What was found
DURING CLIMB, THE AFT STAIRWAY DOOR LIGHT CAME ON. FLIGHT RETURNED TO CMH WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND VENTRAL STAIR DOOR UPLOCK SWITCH COVER BROKEN AND THE SWITCH AND CANNON PLUG RUBBING ON LOOSE TRIM AROUND OPENING OF DOOR. REPLACED SWITCH COVER FOR LEFT SWITCH, REMOVED LOOSE TRIM, AND RELAMPED DOOR OPEN LIGHT IN VENTRAL STAIR AREA. ALL SWITCHES CHECKED GOOD. CHECKED OPERATION OF DOOR, ROLLER, AND HOOK IN THE UPLOCK POSITION PER MM 52-63-00.