What was found
DEN - ON DEPARTURE FROM DEN, THE FLIGHT CREW, UPON ATTEMPTING TO RAISE THE LANDING GEAR, RECEIVED THE GEAR DOOR OPEN LIGHT ILLUMINATION AND THREE RED GEAR UNSAFE LIGHTS. AFTER RECYCLING THE GEAR HANDLE TO THE DOWN POSITION THE CREW RECEIVED THREE GREEN LANDING GEAR LIGHTS BUT THE GEAR DOOR OPEN LIGHT REMAINED ILLUMINATED. AIRCRAFT THEN RETURNED TO DEN. SUBSEQUENTLY UPON LANDING, BOTH MAIN GEAR DOORS WERE DAMAGED. CREW REPORTED NO FURTHER INCIDENT. (M)