As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA- FLIGHT# 3971. CREW REPORTED THAT AFTER GEAR WAS EXTENDED WITH 3 GREEN INDICATED DOWN AND LOCKED UPON SHORT FINAL, NOSE GEAR RED UNSAFE LIGHT ILLUMNINATED WITH LANDING GEAR WARNING HORN. UPON GO-AROUND, NOSE GEAR INDICATED GREEN WITH NO INPUT. MAINTENANCE REPLACED PROXIMITY SWITCH ELECTRONICS UNIT (PSEU), AND NOSE GEAR RIGHT WEIGHT ON WHEELS SWITCH. SELF TEST AND GEAR SWING CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.