As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF NOSE DOOR OPEN WARNING MESSAGE RECEIVED. RAN QRH AND RETURNED TO NEAREST SUITABLE AIRPORT. (FLIGHT 5025) PERFORMED DETAILED VISUAL INSPECTION OF NLG DOORS PER AMM 32-20-00. NO DEFECTS NOTED, VERIFIED NLG DOORS OPERATE NORMALLY. FOUND NLG DOORS FAILED TO CLOSE DUE TO NLG POSITION WAS NOT INDICATING UP & LOCKED. SEE AML 1846046 FOR FURTHER CORRECTIVE ACTION