As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT - FLT266 ON CLIMB OUT FROM CLT, CREW REPORTED THE NOSE LANDING GEAR RED UNSAFE LIGHT ILLUMINMATED AFTER GEAR RETRACTION. CREW EXTENDED LANDING GEAR NORMALLY AND RETURNED TO FIELD. FLIGHT LANDED AND TAXIED TO THE GATE WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE NOSE LANDING GEAR DOWNLOCK SENSOR S845. OPERATIONAL CHECK GOOD PER MM 32-33.