What was found
(CAN) THE CREW OF A BEECH 1900D ON APPROACH NOTICED THE LANDING GEAR LIGHTS, 3 GREEN, DID NOT ILLUMINATE. EMERGENCY SERVICES WERE REQUESTED & THE ACFT LANDED WITHOUT INCIDENT. ACFT WAS REMOVED FROM SERVICE & INSPECTED BY MAINTENANCE. ANNUNCIATOR CONTROL PCB, PN: 101-364578-9 WAS FOUND AT FAULT. THE SUBJECT PCB WAS REPLACED IAW PCBM 20-00-00. GEAR SWINGS & FUNCTION CHECKS WERE CARRIED OUT IAW MM32-30-00. SYS WAS TESTED SERVICEABLE AND THE ACFT WAS RETURNED TO SERVICE.