As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JST - FLT 4088 - ON APPROACH, SELECTED GEAR DOWN, NO SAFE GEAR INDICATION - NLG - CYCLED GEAR HANDLE 4 TIMES, STILL NO INDICATION. RETURNED TO PIT, DECLARED AN EMERGENCY. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED NLG DOWNLOCK MICROSWITCH. OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.