As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ROC-LGA FLIGHT#3862. CREW REPORTED DURING FINAL APPROACH GEAR HANDLE SELECTED DOWN, GEAR DID NOT COME DOWN AND 3 RED UNSAFE LIGHTS ILLUMINATED. ALTERNATE EXTENSION PERFORMED, AND FLEW BY TOWER TO VISUALLY VERIFY GEAR DOWN. AIRCRAFT LANDED WITH OUT INCIDENT. MAINTENANCE PERFORMED PSEU SELF TEST, TARGET TEST, AND CLEANED ALL PROXIMITY SENSORS. LANDING GEAR SELECTOR VALVE WAS REPLACED. OPERATIONAL CHECK AND LEAK CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.