What was found
DURING APPROACH, GEAR WAS SELECTED DOWN AND INDICATED 3 GREEN AND THE RED GEAR UNSAFE LIGHT WAS ON. GEAR WAS RETRACTED AND GEAR INDICATION WAS NORMAL ALL LIGHTS EXTINGUISHED. A SECOND APPROACH WAS ATTEMPTED AND WHEN GEAR DOWN WAS SELECTED THE INDICATION WAS 3 GREEN FOR GEAR DOWN AND THE RED GEAR UNSAFE LIGHT WAS ON. AT THAT TIME THE CREW ELECTED TO RETRACT GEAR AGAIN, SYSTEM CHECKED NORMAL ALL GEAR INDICATION LIGHTS EXTINGUISHED AND THE DIVERTED SERVICE CENTER TO WORK THE ISSUE. DUE TO THE GEAR UNSAFE LIGHT THE CREW NOTIFIED THE TOWER AND EMERGENCY RESPONSE WAS DISPATCHED FOR THE ACFT DURING LANDING AS A PRECAUTION. THE ACFT LANDED WITHOUT INCIDENT.