As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5480 - NOSE LANDING GEAR AND GEAR DOOR INDICATION REMAINED "RED" ON RETRACTION. DECLARED EMERGENCY, LANDED CVG WITHOUT INCIDENT. INSPECTED AND GREASED NLG AND DOORS. ADJUSTED STRUT PROX SENSOR, SWUNG GEAR 15 TIMES INCLUDING PRIORITY TEST. REPLACED PSEU DUE TO NO CODES DISPLAYED FOR EVENT. NO FURTHER DEFECTS.