What was found
KDAY - FLT 8 - AFTER TAKEOFF DOOR NOT LATCHED LIGHT AND ALTERNATE MAIN DOOR LIGHT REMAINED ILLUMINATED. THE FLIGHT CREW RECYCLED THE LANDING GEAR, RETURNED TO KDAY. MAINTENANCE RIGGED THE MLG DOOR CONTROL VALVE. MAINTENANCE REMOVED AND REPLACED THE MLG DOOR ACTUATOR AND CONTROL VALVE AS A PRECAUTION. OPERATIONAL CHECK OF THE MLG DOOR INDICATION SYSTEM WAS NORMAL ON GROUND CHECK. (M)