As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BDA - FLT 1443 - EN ROUTE BDA-JFK, SHORTLY AFTER TAKEOFF, GEAR RETRACTION EICAS DISAGREE MESSAGE ILLUMINATED. NOSE GEAR LIGHT REMAINED GREEN. NOSE LANDING GEAR WOULD NOT RETRACT. RETURNED BDA AND LANDED WITHOUT FURTHER INCIDENT. PERFORMED FUNCTIONAL CHECK ON NOSE LANDING GEAR. UNABLE TO DETECT FAULT. REPLACED LANDING GEAR SELECTOR VALVE AS A PRECAUTIONARY MEASURE. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)