As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED GEAR DISAGREE WARNING MSG ON CLIMB OUT AFTER SELECTING GEAR UP. MAIN GEAR RETRACTED, NOSE GEAR WOULD NOT. COMPLIED WITH QRH EXECUTED AIR RETURN TO HSV. EMERGENCY DECLARED 5000 LBS FOB. APPROX 28 SECONDS AFTER GEAR SELECTED MSG APPEARED, WHILE FOLLOWING QRH. INSPECTED LANDING GEAR, NO DEFECTS NOTED. INSTALLED DOWN LOCK SAFETY PINS IN GEAR IAW 276107 3 FOR MEL.