As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: LANDING GEAR CONTROL INTERFACE UNIT ISSUE. EMERGENCY DECLARED, FLIGHT DIVERTED TO DFW AND FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED MAIN LANDING GEAR DOOR SENSOR (SEE AALA201901039003) AND LANDING GEAR CONTROL INTERFACE UNIT 2 AND PERFORMED SATISFACTORY OPERATIONAL CHECK.