What was found
FLIGHT 8714 WHILE ON TAXI FROM THE GATE AT SAP THE CREW REPORTED THAT THE RIGHT MAIN LANDING GEAR UNSAFE RED LIGHT ILLUMINATED AND WARNING HORN SOUNDED. THE AIRCRAFT RETURNED TO THE GATE WITHOUT ANY FURTHER INCIDENT. MAINTENANCE TROUBLESHOOT THE INDICATION PROBLEM AND FOUND THE RIGHT HAND MAIN LANDING GEAR SEGMENT ASSY UPLOCK CRACKED. THE CRACKED RIGHT HAND MAIN LANDING GEAR SEGMENT ASSY UPLOCK IS IN THE PROCESS OF BEING REPLACED. THE UPLOCK WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE.