What was found
ON TAKEOFF, THE FLIGHT FINE PITCH STOP WARNING HORN SOUNDED FOLLOWED BY AN ACRID SMELL. ON APPROACH THE SHOWING GEAR DOWN AND LOCKED THE CREW OBSERVED AN UNDERCARRIAGE FLAG ON THE ASI AND ELECTED TO HAVE VISUAL CONFIRMATION FROM THE GROUND THAT THE GEAR APPEARED SAFE. THE AIRCRAFT LANDED AT POINT OF DEPARTURE WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE FFPS HORN SEVERELY OVERHEATED THE HORN WAS REPLACED AND ALL RELATED SYSTEMS WERE CHECKED IN CONJUNCTION WITH NLG SWING. SMOOTH OVERWEIGHT LANDING CARRIED OUT. AIRCRAFT RETURNED TO SERVICE.