As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5200 - DURING LANDING APPROACH AT BOS RECEIVED GEAR DISAGREE WITH ALL THREE GEAR INDICATORS SHOWING RED, CREW DECLARED AN EMERGENCY AND PERFORMED MANUAL GEAR EXTENSION. FLIGHT LANDED WITHOUT INCIDENT. REPLACED THE LANDING GEAR CONTROL ASSEMBLY (GEAR HANDLE).