What was found
PERFORMING LANDING GEAR UPLATCH CHECK, THE RIGHT GEAR UNSAFE LIGHT AND GEAR DOOR OPEN LIGHT ILLUMINATED. CYCLED THE GEAR DOWN AND UP, LIGHT WENT OUT AND THE GEAR UPLATCH CHECKED NORMAL. REPLACED THE RIGHT MAIN LANDING GEAR UPLATCH MECHANISM. GROUND CHECKED NORMAL IAW DC-9 MM 32-31-4 AND DC-9 SUPP MM 32-60-00.