What was found
CREW REPORTED, ON APPROACH, NORMAL GEAR DOWN INDICATION UNTIL FLAPS WERE SELECTED BEYOND 15 DEGREES. GEAR UNLOCK LIGHT ILLUMINATED, AND NOSE GEAR DOWN LOCK LIGHT FLICKERED, GEAR WARNING HORN SOUNDED. ABORTED APPROACH TO TROUBLESHOOT SYS. SUBSEQUENT GEAR EXTENSION RESULTED IN NORMAL INDICATION. AS A PRECAUTIONARY MEASURE, EMERGENCY GEAR EXTENSION WAS PREFORMED. LANDING WAS UNEVENTFUL. MX WAS ABLE TO DUPLICATE MALFUNCTION DURING GEAR SWING. RERIGGED NOSE GEAR DOWNLOCK SWITCH, PERFORMED SEVERAL EXTENSION AND RETRACTION TESTS, SYS CHECKED OK. ACFT RELEASED BACK TO SERVICE.