As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH WHEN GEAR HANDLE LOWERED, HAD ONLY TWO MAIN GEAR GREEN LIGHTS - NO NOSE GEAR LIGHT RED OR GREEN. FOLLOWED CHECKLIST WITH GOOD NLG PIN .2500 INCH AND MAINT CONCURANCE SHOWED GOOD GEAR. NOSE GEAR LIGHT REMAINED OFF ENTIRE TAXI UNTIL POWER SWAPPED OVER AT GATE. REMOVED AND REPLACED PROX BOX. NO HELP - REINSTALLED ORIGINAL. REPLACED NOSE GEAR INTERLOCK SWITCH. COMPLETED GEAR SWING. CHECKS OK.