As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BWI - FLT 8002 - AFTER TAKEOFF FROM BWI, CREW WAS UNABLE TO RETRACT THE LANDING GEAR. FLIGHT RETURNED TO BWI AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE RIGGED THE NOSE LANDING GEAR GROUND SENSE ROD ASSEMBLY WHICH HAD BEEN RECENTLY REPLACED. (X)