What was found
ON CLIMB-OUT FROM ATL, GEAR NOT LATCHED. LIGHT CAME ON, RECYCLED GEAR AND NOW GEAR AND DOOR LIGHT ON. DIVERTED TO MIAMI. TROUBLESHOT, FOUND RT MLG UPLATCH SWITCH BAD. REMOVED AND REPLACED SWITCH I.A.W. 32-30-00. OPS CHECKED NORMAL ON GEAR SWING, RETURN ACFT TO SERVICE.