As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF RECEIVED AN EICAS LANDING GEAR DISAGREE MESSAGE. CREW COMPLIED WITH AOM VOL 1 PROCEDURES AND DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE. LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. R & R LT LANDING GEAR ELETRONINC UNIT IAW AMM 32-32-01. PERFORMED MLG SWING. THE OPS CHECKED GOOD IAW AMM 32-30-00. ACFT RETURNED TO SERVICE.