As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW FLIGHT 3143 THE CREW REPORTED LANDING GEAR SYSTEM NR 2 INDICATES AURAL AND LOCAL ALERTS ACTIVATED, NOSE GEAR DID NOT INDICATE DOWN AND LOCKED. AIRCRAFT LANDED WITHOUT FURTHER PROBLEMS. INDICATION PLACED ON MEL. CLE - MAINTENANCE REMOVED AND REPLACED SYSTEM PROXIMITY SWITCH ON NOSE LANDING GEAR. OPERATIONAL CHECKS WERE GOOD. AIRCRAFT WAS RETURNED TO SERVICE.