What was found
DFW - FLT 3594 - DURING APPROACH CREW REPORTED NO INDICATION FOR LEFT AND RIGHT MAIN LANDING GEAR DOWN AND LOCK LIGHT. APPROACH WAS ABORTED, LANDING GEAR WAS CYCLED TWICE AND THE RIGHT DOWN AND LOCK LIGHT REMAINED OUT. EMERGENCY WAS DECLARED AND AIRCRAFT WAS LANDED WITH NO FURTHER INCIDENTS. MAINTENANCE REPLACED THE LIGHT BULBS IN THE INDICATOR LIGHTS IAW SAAB MM. AIRCRAFT WAS RETURNED TO SERVICE. (M)