As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF AND GEAR RETRACTION ATTEMPT, GEAR DISAGREE WARNING AND NOSE DOOR OPEN WARNING MESAGE ILLUMINATED. NOSE GEAR REMAINED DOWN. (FLT 4522 REPLACED NLG SELECTOR VALVE, PERFORMED OPS CHECK OF LANDING GEAR EXTENSION AND RETRACTION SYSTEM, BLED NR 3 HYDRAULIC SYSTEM IAW AMM. P/N: 750006000 S/N ON: 1807 S/N OFF: 0063T